WORTH REPEATING:
When fraud fails, force follows.
Because liberalism is a sustained violation of human nature, violence as a tool of change is never far from it it. Its radicals use violence to get state power, then use state power to commit more of it. As the Enlightenment philosophes noted with pride, the most ruthless revolutions are carried out not against state power but with it.
In possession of state power, liberals can behave more decorously. There is no need to throw pies at conservatives when you can unleash bureaucrats and judges on them.