My acceptance of 2nd Amendment / Private gun ownership is the fact that there is no public duty doctrine for cops. The police have no specific duty to be competent at their job. They can even be grossly bad at it, outright gun people down and perform what amounts to street execution and recieve no punative response. A cop who fails to perform their public duty, or even intentionally doesn't is never going to be punished. Without incredible public pressure.
All of this stemming from the police having the privilege of Qualified Immunity. In 1981 the Warren vs District of Columbia found that police do not owe a specific obligation to citizens to provide police services under the public duty doctrine. Castle Rock v. Gonzalez found the same basic ruling. All of this means police have what is called Qualified Immunity, This doctrine, invented by the Court in the ashes of the Civil War, immunizes public officials even when they commit legal misconduct unless they violated ‘clearly established law.’ That standard is incredibly difficult for civil rights plaintiffs to overcome because the courts have required not just a clear legal rule, but a prior case on the books with functionally identical facts.
What we have today is horrific. When ordinary citizens violate a law (usually that they had no reason to think even existed, given the vast reach of the law today), they can’t escape responsibility by saying, “But we did not know that was illegal.” But when it comes to the police and other government officials, they can and do escape responsibility because the courts say, “How were they to know their conduct was illegal?” because of qualified immunity.
So as a point of order, no I don't trust the police to protect citizens and believe its fine for citizens to have firearms for their own protection.