Your party attracts the loons, the miserable, the envious and angry. It gives them a target ( their greatest opponent), and it foments their violent tendencies into action.
It liberal tenants also provide the “Ends Justify the Means” justification for their violence. And then they celebrate their violence (check out the CEO Killer Luigi’s social media site full of leftist adorers.

Not every liberal is violent, but the overwhelming majority of cases come from the Left for this reason.

Not every liberal is violent.
Not every single violent action comes from the Left….just most of them…overwhelmingly so.