Liberals can and have been violent in the past. No group large enough is free of extremists.
it's not fair to either side to generalize like that. Also, we're all Liberals in the US, just different flavors of it.
The problem with that statement is a lot of Americans would be foaming at the mouth if you labelled them a liberal due to a severe misundertanding of the meanings of words like 'liberal', 'progressive', 'communist', 'socialist'.
so help me in fixing that or we'll end up with another literally here :)
I'm not saying your understanding is wrong, but theirs.