Because EVEN in real life you are not allowed to say whatever you want
where ever you are
2nd of all most of the things you said were pervasive,
it's better to ban you then to have 80 players leave because of you
A ban i kinda the way riot games tells you that you are worth less than other people
and therefore you should stay quiet.
I like how many of the people flaming bring the "don't be crybabies" argument when they forget mentally disabled, people with mental health problems and other "snowflakes" might play the game aswell
if you wouldn't do it in society to a stranger , why should lol be different ?