This is exactly the same reason police officers are ethically in the wrong. They could decide that "enough is enough" and push out the "bad apples" among them. Instead, they do nothing. That is their ethical failing.
The protesters (and their supporters) are doing the exact same thing, ethically. They refuse to even attempt to push out the extremists, as evidenced by the widespread rationalization and minimization of their actions.
These are very basic ethical dilemmas. Do you or don't you call out and punish bad actors among your group?
Ancient tribes were generally okay with anyone of their tribe committing any atrocity as long as it was against a member of a foreign tribe.
Civilized people condemn and punish even members of their own tribe and do it even when the victim is a member of a foreign tribe.
The other is a loosely networked group of malcontents and opportunists with a relatively low regard for commercial property rights and capitalism.
It's disingenuous to equate them, and something tells me you know this and set up a throwaway account to protect your main from the entirely predictable barrage of criticism.