Why is punishment so harsh on a first time offenders

I get the banning system and all when it comes to league but what ever happen to being banned for 3 days then a week and so on until you get perma banned i still think that should be in play tbh i got banned for doing one silly game against randoms where yes we fed the enemy hard just wanting to give free S+ but then we got banned and its a 14 day one its abit unfair especially for first timers. I think riot needs to take this stuff in account before being punished I just want to know why it was changed Riot i hope you see this and can answer my question
Report as:
Offensive Spam Harassment Incorrect Board