Which specific incident are you referring to? Not the one where the American citizen tried to run over the ICE agent with her car, right?

the usual flipfloppers who support both the Jan 6 riot and the killings of anybody not agreeing with their dear leader

You're either not American or are much less in tune with what's happened than you think.

By the way. "Iran is a bad government" and "I don't want an avoidable, illegal hot war with Iran" can coexist.

Clearly that one although it is unclear if she really wanted to run him over. That was a sorry event on all sides from the 'professional protesters' who think they can just interfere with police operations without running any risk themselves - the woman's partner screamed 'why did you use real bullets' - to the policeman who, having been dragged along by an illegal several weeks ago was clearly hair-triggered when it comes to vehicular assault.

The lesson to be learned here is that a) protesters should realise that they are bound by the same laws as all others no matter how virtuous they consider their causes to be and that interfering with police operations comes with real risks and b) the combination of such actions by protesters with the experiences police officers have had during encounters with their targets can make them react in ways which it can be assumed they'd normally not have done. Shooting that woman did not reduce the risk for the police officer, at all. It actually increased the risk of damage to him or others because wounded or dead people behind the wheel can turn vehicles into unguided projectiles.