Getting one's rights abused by the government is awful because in general, people tend to have little chance of getting restitution against their abusers. Government has more financial muscle (by stealing from everyone else) and it's various laws that give agents of said abuse sovereign immunity to prevent accountability. This along with the libertarian understanding of history are why many if not all view government as evil. One can argue that police brutality is one of the worse abuses of government given how much of a presence police have in the general populace.
Unlike conservatives (with very few exceptions) who think police brutality is a myth (or alternatively think certain groups of people deserve it from initial contact), libertarians of all stripes know that abuses from armed agents (along with their unions) of government are a serious problem that needs to be addressed. People that actually see that there is a problem want to know what can be done to stem the abuse and hold abusers accountable.
While filming police (tactics promoted by excellent organizations such as Copblock and Photography is Not a Crime) has increased attention to the issue and exposed lying cops, the actual accountability is far and few in between. Filming also comes with risks, with police confiscating recording devices and deleting the footage along with arresting them on bogus charges. Along with independent citizens filming there have been suggestions that having police wear body cameras would help stem abuse but so far the results are mixed. Some suggest to working within the system to remove bad laws that police use to harass people that cannot fight back. Within the system one has to attack and dismantle police unions (which for some reason anti-union conservatives won't attack) who are very responsible for the little to no punishment police receive when they infringe on the rights of the citizenry. Full and complete end of all victimless crime laws (drug, gun, etc) would also stem much of the harassment of lower income people.
With the continuing of militarization of police there must be a call to limit police interactions and government is not going to help with that. The solution is to use alternatives to relying on government agents. Those solutions would be the following:
1. Cell 411
Cell 411 is a free emergency management mobile service. Create your own personal network with friends and family that you trust in case anyone needs help. In addition it's useful for those who engage in protests and activism with it's option for live broadcasting. Think a more personal version of a neighborhood watch.
2. Asserting Your Right to Bare Arms
A common trope that police worshipers like use against their critics is that without them nobody would protect you. Never mind the fact that the Supreme Court has ruled otherwise. Libertarians believe gun rights are an absolute and that everyone has the right to defend themselves and carry arms. Banding together with other gun owners who distrust police to patrol neighborhoods with deter potential criminals who see that they'll get shot. In addition any potential police harassment will shine a light on the conservative lie that police won't confiscate arms.
3. Creating private defense/security companies
The private sector has a significantly better track record than the government (parasite) sector and security is no different. When Detroit went bankrupt many of the government "services" were cut back including the police. In enter Threat Management founded by Dale Brown a private security firm that does the same thing government police do but without violating the rights of people. For more information on Brown here are some interviews with Copblock, Tom Woods and Jeff Berwick.
3. Avoiding the police and Blue Lives Matter when possible
Defense attorney's make their case (Part 1 and Part 2) that one should never talk to police. This should also should apply to people who apart of Blue Lives Matter. Not wanting to associate myself with cops and conservatives are one of the reasons why I personally am not a member of any gun groups. Statists don't like being challenged and sometimes may get violent (either directly or indirectly) when they are. De-associating one self from open authoritarians of all political stripes who may or may not make use of Swatting when these types of people hear of your views can help with preserving your own personal liberty.
Part of the reason for using alternative solutions to government is to deny government revenue. This is why I view protesting as pointless and ineffective. This may different depending on the state but in my state of New York, police are paid overtime when out covering protest gatherings. As we libertarians know, a cop's "paycheck" is in reality a welfare check so by protesting people are in fact increasing the tax (read stolen) money given to the parasite class. Not to mention that government will always try to infiltrate these protests with agitators to get them to turn violent in order to justify more liberty crackdowns.
I'm not going to sit here and say these solutions will put the government monopoly out to pasture overnight. However it's been long overdue to get people to realize that individuals must provide their own self defense.