Marxism is notoriously violent, as are its advocates, and we can trace that tendency back to Sergey Nechayev. His 1869 pamphlet titled
The Revolutionary Catechism is explicit about the need to exterminate everything so that it can be replaced with Marxism.
The modern Democrat party is all-in on the revolution. “The only form of revolution beneficial to the people is one which destroys the entire State to the roots and exterminates all the state traditions, institutions, and classes… Our task is terrible, total, universal, and merciless destruction.”