Why does the AI get to make it's own rules?

I recently started playing franchise mode and managed to win in the first season without interfering by playing the games since I get tired of the AI inputting it's own set of rules for boarding, tripping, hooking, and so on while mostly running every opposing team with nearly  a golden halo to keep them out of the box. I've even seen physics defied once wit the puck curling around my goalie. I was surprised how things seemed to be going fairly well with just doing the managing and fixing the facilities. I should have known this enjoyment was not to be tolerated for long. Just stimulating to days to reassign my scouts quickly got my through the preseason and ready for my cap compliant team to start season 2 was great- until passing the cap compliance date. Even though my settings only allow for goalie rotation, the AI was quite willing to change my lineup, move some players to the minors and bring up others and make whatever changes it felt like. I deleted 3 previous saves and tried different things to prevent the AI from interfering with my team and it's dominance- including reading the riot act to my coach stating to do what I'm telling him while the answer agreed with me, yet the same thing happens. I'm just curious what exactly the AI format has a problem dealing with. There's ways things could be made more challenging by the AI ,perhaps by having the other teams build better teams, but there's no need to it basically throwing a fit because I don't choose to dismantle my team with idiotic trades to have me make their teams better without having players in place to keep my team competitive. I would seriously ask it, "do you even hockey, buddy," if I didn't know the concept couldn't be grasped by it.