Unfortunately some kids do that.

There were lilac bushes growing in our park, as well as flowers planted by the park staff. There are a lot of kids running around there and they often break the branches of the blooming lilacs.

There is nothing wrong with making a bouquet of lilacs to give to your parents, but after playing, children would throw the lilac bouquets on the ground.
They also sometimes ripped flowers out of the flowerbeds with the roots.