You don’t have to feel bad for cutting grass. That’s grass its entire evolutionary skitch, albeit naturally with being grazed instead of mechanically cut.
Grass survives cuts extremely well. Most of its mass is below ground. By thriving in areas that are frequently grazed / cut, it outcompetes other plants. Natural meadows without grazers quickly turn into forests. But tree saplings don’t survive being eaten, so whenever there are grazers (or human cuts), grass outcompetes trees.