I understand your point, but saying "all cops are pigs" doesn’t solve anything. If anything, it fans the flames and puts more people in danger. Extremists thinking on both sides of the isle is dangerous and non-constructive. The real issue isn't cops or ICE agents, it's the policies that allow them to do what they're doing. If we want to make change that's what needs targeted. All the violence (whether in speech or riots) is only going to strengthen the position of the right (calling the left criminals, saying they don't respect the law, and whatnot).
As a side note, this is exactly what the majority of Americans voted for. Whether it's right or wrong, Trump ran his campaign on the promise of mass deportation, and the majority of Americans loved it. Now the rubber is meeting the road. They're seeikg how ugly it is, and hopefully that's enough to change some minds.