You probably should say the "center" instead of the "left". Or maybe the "liberals". That's because the "left" historically has been as assertive as the "right" if you look at the extreme communist parties VS fascists/feudal parties.
I do think you have a point though, but you can't be liberal and authoritarian at the same time. So to push for liberal ideas and laws/rights, while also pushing to enforce it through anti-liberal means is pretty contradictory, and so it makes sense most liberals don't do so.
Also remember that liberal societies are the exception in human history, not the rule. Almost never have people rallied around the idea that each man has a natural right to life, liberty and property and governments must not violate these rights.
I do think you have a point though, but you can't be liberal and authoritarian at the same time. So to push for liberal ideas and laws/rights, while also pushing to enforce it through anti-liberal means is pretty contradictory, and so it makes sense most liberals don't do so.
Also remember that liberal societies are the exception in human history, not the rule. Almost never have people rallied around the idea that each man has a natural right to life, liberty and property and governments must not violate these rights.