Currently the Federal level is blocking the State prosecuting such clear breaches of the law.
Approaching a vehicle that is already stopped, perpendicular to traffic, initially to tell the driver to move and then to make an arrest for obstruction of justice, is not a "traffic stop", and the agents in question therefore did not in any way "pretend to have local traffic enforcement powers". ICE are legally entitled to require protesters to get out of their way. That's a consequence of them being federal LEO, and of federal law prohibiting everyone from obstructing LEO (which includes things like physically shielding others from arrest, impeding their movement towards whatever place they need to get to to do their job, etc.). Protesting and asserting 1A rights is not a defense to the charge of obstruction of justice.
But you do care what caused someone to break the law - you just said that if breaking the law (murdering someone) was for keeping order then it's ok. It's very easy to see that you agree with enforcing "law" just because you agree with current administration (otherwise it's very hard to argue that what ICE is doing has anything to do with being lawful).
You have no care for the law nor for humanity. You're supporting summary execution by a stasi; you seriously need to step back and reconsider your belief system.