You should be worried about how the game affects everyone, including stuff like the average quality of games, things that really annoy people and making sure the most people have fun.
Saying a problem isnt a problem because its not a problem for you personally…doesnt make the problem go away.
Intentional disrupting behavior does exist even if its malicious. Smurfing (Intentional deranking then climbing with the chance of maintaining a boosting service in stacks) does exist and will exist in every competitive game until the ultimate heat death of the Universe.
‘Murder’ does exist and will exist until the ultimate heat death of the Universe.
‘Stealing’ does exist and will exist until the ultimate heat death of the Universe.
‘Wars’ exist and will exist until the ultimate heat death of the Universe.
‘Cancer and disease’ exist and will exist until the ultimate heat death of the Universe.
I guess the solution for everything that’s wrong according to your logic is, “oh well, just ignore it. Don’t bother ever looking for solutions or try to make anything better.”