Marxism does not walk in waving red flags and quoting Karl Marx.
It shows up in the excuses people make.
Vandalism becomes “self-expression.”
Mob chaos becomes “celebration.”
Property rights, public safety, and the rule of law become negotiable, as long as the right political cause is attached to it.
That is how a society rots from the inside.
Not all at once, but slowly, by teaching people to defend the behavior that makes a peaceful, functioning civilization impossible.