Maxperson
Morkus from Orkus
Except that you only claim to allow what I say you disallow, and you then contradict that claim of allowance, and pretend that you have not, by insisting that a player has to explain their "in-character reason" for why they as a player did something that seemed cool based on the circumstances at hand - and the only reason why you demand the explanation that you have given? Because maybe they are cheating by having the wrong reason.
Still batting 0. I expect a rational in game explanation because my game is a living, breathing world where things have to make sense. All my players provide reasons for why they know what they know if it isn't immediately obvious. Not one of them would ever cheat.
If the thought behind it doesn't matter, you wouldn't be demanding an explanation of in game reasons. You'd just assume that because there are valid in game reasons for the character to do what it did, one of those must have been the reason. Since you don't assume that, and in fact try to catch out your player as giving the wrong reason, or not explaining it well enough, you are absolutely trying to police the player's thoughts.
Don't presume to tell me why I do things. You're so horrible at it that you should just give it up. You've not once come close to being correct when you try it.