It's far more than just most of the time that they "just do their job", it's like 99.9999% of the time. You say "cops who are caught doing wrong" as if it's a lot or something. There are over a million cops, and there are less than a couple dozen or so that wrongly kill every year. The media just happens to run with every single instance of it today relentlessly, which don't get me wrong, they 100% should. In comparison to every other job, i'd say the mess up rate is probably less than most in reality. But obviously, when a cop messes up someone can die; unlike a postman who messes up, and someone just loses their package.

I know a lot of cops, and every single one of them does things like this almost weekly. No one calls the police for something good, any real call typically involves some situation like the meme, and they always do their very best to handle it well.

The reason why there is the "just doing my job" defense is because an officer doing their job is supposedly "inherently dangerous." Responding to danger is them doing their job, and using their judgment with how to handle that danger is them doing their job. Philosophically, the "just doing my job" defense is valid almost every time, it's just that that VERY small minority does it wrong in that one instance; and sadly, because of the nature of the work, that job may result in death.

When you think about the fact that there are over a million cops walking around with guns; many of which are undereducated and underpaid, it's almost a MIRACLE that wrong uses of discretion aren't more common. Not every cop goes to 4 years of college for Criminal Justice, and then adds a 6 month academy on top of that. Many, i'd say the majority, don't have even close to that level of education, and some types of cops like sheriffs don't even need to go to an academy, so they have zero training.

People need to look at the real issues, and not just blindly hate all cops, that's the real problem at hand.