Anyone who destroys or vandalize national flag or national monuments, historical figures/statues, war memorials, public property like court houses, libraries or police building, buses, trains etc., should face legal consequences.
If it’s non-citizen or foreign students , not only the person but his/her entire family should be deported immediately and never have chance to step into USA again.
If it’s US Citizen, he/she should be sent to Jail for at least 6 months. No exceptions. No monetary penalties but just jail.