Does anyone feel that behavior system should be recalibrated so that 10k is for positive mindset players only?

I play sub 3k mmr in SEA server at 10k behavior score but games still feel toxic frequently with players blaming others, tipping and trash talking enemies.

I understand that any human can get mad when you have invested 40 min into the game only to find your core not make the critical bkb even after dying 5 times in a row to stuns or the support farming on the opposite side of the map but in almost 100% of the games, there is someone trash talking the enemy when they're winning or just won, and in like 1/3 of the games, there is some guy sulking at his team mates before 5 min. The discrepancy between behaviour is obvious when in some matches, the most outspoken player is pretty much a disappointed dad complaining about a game losing throw and then in other matches, there is some other guy who can't stop blaming someone from the get go with racism sprinkled in.

I play sporadically and back in 2013, sometimes people would actually say "Thank you for the game" and that was when there was no behaviour score. It seems like a lot of players are jaded now and the behaviour scores just put them a lot of them into one bucket unless they feed on purpose or abandon. I feel that 10k should be reserved for the best behaved players who don't tilt except for the rarest occasions.