Well, I have read one fic where the whole prompt was that Steve was secretly evil the whole time, and it was really good- and really creepy, and it seemed IC for that variation of Steve... But the point was that it was an Evil!Steve AU, and his actions would be OOC for the main canon, so I can see why people might like OOC (but logical) versions of characters.

But, when it turns into someone ignoring canon characterization in a non-AU, I have to ask that same question.