1. Wow, youre only fifteen, theres not many people of our age (im 16) who can actually have an intelligent argument, without screaming "im right, your wrong" or whatever.
2. When i was cussing starting around 10 ish, it was stuff like that that gets me grounded for 6 and a half months (and counting) and that would teach you whats wrong, unless one end of the party ends up not understanding their part.
3. To me, there are 3 types of parents who let their kid play CoD, my kind where i get grounded for seemingly ever if i do something wrong, then the ones who shouldnt let them, because they cant disipline right for this situation, and the worst kind (this actually exists, it might happen to me if my dad passed, not my mom) where the kid is in charge and the parent(s) let them do whatever they want, do everything for them, because the parent is "scared" the kid would do something to them. (You should look up this 12 yo who went on Dr. Phil and they blame the videogame industry as a whole on youtube)
4. These games might be a decent way to tell them to not do it irl. Think of this, lets say a kid is antisocial, maybe homeschooled, idk, but the only games they play are like mario, pokemon, solitaire, E stuff, and never hear about guns or crime, or anything of the sort. When that kid grows up and moves out at 18, picks up gta, and finds it fun, and thinks why not do it irl, they never had the discipline not to do it, and its only ok in games, because its not real. Hopefully, and quite a bit of the time they control that thought and maybe gets guns just to hunt deer or shoot at random stuff in the woods, or maybe not even at all, but there are people that believes that its more fun to murder and rob or whatever irl. It depends on the person.
5. Idk about what normal girls do, cuz im not one, but ik most boys i ever talk to play such games, pubg, apex, cod, gta, ect, but everyone of them doesnt "seem" to want to do anything rash irl.
(Also, are you a girl, its the way you included "...doing their nails or whatever..." but idk :/)