Indeed it is. But nobody - ever, at what ever level - made him go into the business of pro football. Show business.
He made his choices, garnered a tidy pile. It's not up to you or me to question his career path. I don't care about owners. If he thought that even with millions in his personal pocket, he was getting ripped off, he could find another trade to ply or not gotten into the biz in the first place.
What he did was lift his leg and sh*t upon the venue where he worked, the fans that ultimately paid him. And jerks they may well be, but they peel off the cash and watch the tv and buy products from those ads. That tv money flows to the NFL and the owners and the players because the ads sell products. Nice for him that he could afford to be so childish and unappreciative - few of us can...or even would do so, as a matter of principle.
I've certainly had disagreements with employers, and perhaps the type of business that employed me - but I never left uttering chip-on-my-shoulder comments. Not that I was in the public eye; he is and so If I had a club, or were a pro player, I would shun him. I could never trust him, fearing when he would turn again. Loyalty counts.
Like you mention or imply, football is a violent sport. I'm certain that somewhere along his career, he himself cut a player in the calves, poked a finger, hit anothers' vulnerable knee, and so on.
2 cents.