Ew, why are people on youtube able to moderate replies to their own comments? Like I can post an opinion on some random video and if people reply I can just delete the ones I don't like. I don't think anyone should have the power to silence other commenters like that. If you feel that your opinion is important enough to share with everyone else, you shouldn't be able to silence others who may disagree with what you said. The only time something like that should be allowed is if you're moderating replies to your own video. If you're on someone else's video commenting, you shouldn't be able to delete anyone's comment, that's dumb.
I replied to someone's comment they made on a video disagreeing with what they said. They just deleted it to make it seem like no one disagreed with them.