vas1820, play is good. Play is how children explore and build up their notions of how the world works. As a very wise person said “Play is the work of children.”
But part of that experimentation is finding out what the acceptable limits are. There is some play which crosses the line of what is healthy and right. For instance, if kids were playing “Cossacks whipping Jews” or “Klansmen lynching Blacks” anyone with a heart or brain would put a stop to it. If play is excessively or repeatedly or increasingly violent that’s not just for pretend. It’s a warning sign that something else is wrong.