Tennis is supposed to be one of the tools to expand your world and make new friends outside of your daily life and develop leadership and personality.
This is the issue due to the high expectation of winning by parents / coaches (who encourage their players "Cheat back when cheated!").
Whereas there is only one winner in a tournament, there are many WINNERS in our lives!!
We tell people "Tennis educates players to be better human through experiencing and solving difficulties during a match by themselves regardless of winning or losing." Tennis teaches us lifeskill. (Not from "1 set match" or "8 games match", though.)
Those parents and coaches who let their kids "cheat"...do you want your kids to become good at "cheating in life"???
It's parents' responsibility to encourage their children to ENJOY the opportunity and try their best and be honest. If they don't, don't turn your back around....kick your kids off of tennis court!!