This is likely to prevent people from cutting the plants and later saying they picked up a fallen bit.

People in the replies not realizing how much support the us has given to Ukraine or how much military capability Ukraine has on its own.

Then who should be the one deciding what gets censored and how?

Hate speech is not protected by the constitution and is typically a point of proof in hate crime cases. There are also civil remedies for directed hate speech in many states. Also assault is a crime that only involves words.

We allow generalized hate speech because we believe that the appropriate counter to speech is speech.

“If there be time to expose through discussion, the falsehoods and fallacies, to avert the evil by the processes of education, the remedy to be applied is more speech, not enforced silence.” - Justice Louis D. Brandeis