The little tree cried

Tonight, my mother took me to go to Riverside for a walk. Walking halfway, I saw a person climbing to the tree, stepping on the branch and shaking the trunk with his hand, and another person pulling the end of the branch under the tree and pulling it down. The branches are swaying and it looks like they are crying.

Why do small trees cry? I think it must be too sad. I really want to say to those who don't care for trees: "If the tree is broken by you, our environment will be destroyed. Have you thought about the consequences?"