I don’t necessarily agree or disagree with you; I’m playing devil’s advocate because your line of thinking is invalid.
1) A player giving up during a game against their arch rivals, sulking and literally walking about the pitch, pushing an official and not caring anymore and essentially letting a 7-0 drubbing take place. This Captain is the unofficial captain and during his time in the club has won one League Cup.
2) A player hears abusive shouting from the crowd and assaults the fan. This player is widely regarded as the catalyst for transforming the club and returning us to winning ways, and at this point had won two league titles as “THE” man.
3) A player known for their full throttle play style gets sent off a few times. This player is arguably the greatest captain of his generation and never turned in less than a 7/10, and on countless occasions quite literally dragged the team over the line. I can’t count high enough to explain the number of trophies and personal honours he won.
There’s a difference between petulant capitulation, and losing your head. Especially when it can become habit forming. Yeah it was annoying when Keane got sent off, but it’s an entirely different kettle of fish for fans and players.