And we have the right to make them not be police anymore.
Disclosure: I am a staunch Second Amendment supporter, well into the "extreme."
The Second Amendment does not override the employer-employee relationship - firearm possessors are not in a "protected class."
You're free to have that firearm and you may not be arrested for it - even while at your place of employ. We need not maintain your employment, however.
Which is why I argue that it's an intractable problem barring repealing the Second Amendment. Even if there are legal ways to accomplish merely disarming the police, it doesn't solve anything unless you disarm everyone.
I get that accidents happens, but something has clearly gone wrong with either the training or lack there of.
Not while acting as government agents they don't, just as those acting as government agents don't have the same freedom of expression and association in that context as they do as private citizens.
In fact, the underlying premise of the second amendment (alluded to, though not expressly stated, in it's preamble) is that there would be no substantial professional military forces or paramilitary police force in the US, and that there would instead be a dependence on (selective or mass, depending on situation) mobilization of the citizen militia to address threats requiring response of an armed force. The second amendment isn't rooted in the idea that having an armed population provides security against government armed forces, it was based on the premise that the government relying on the armed citizenry instead of government armed forces, military or police, was a foundation for securing liberty.
Employers are allowed to say "no guns at work" in other situations, correct? Does a cop have a corresponding First Amendment right to call everyone a n-word while out on patrol?
Unfortunately, yes.
As far as I know, racist speech is protected so long as it doesn't provoke violence against specific individuals ("fighting words.") Although IANAL and I'm willing to concede that I might be entirely wrong, and I don't want to go to the mat for racists anyway.