You cant stop actual swearing, cos you're put through 90mins of uncontrollable emotion.
It's how far you take it that's the problem.
The game plays to people's level of control.
If they had a stat on foul language before and after VAR i expect you would see a massive rise in swearing.
And VAR wasn't a fans creation.
The blatant abuse is where the line shouldn't be crossed. Think about the families sitting around you, not just the onfield antics.
It just wouldn't work going to a game with everyone shouting 'You Wally'
I'm not a big enthusiast on foul language, but I understand the stress has to be released somehow ( to an extent )
The game is dying anyway, take out raw emotion and that's the final nail in the coffin.