No, corruption is a synonym for change, although with connotations for the worse. Any behavior or use of magic that is repeatable is capable of changing or corrupting that individual to varying degrees.
As for whether or not this is a personal theory, well my evidence for my arguments come straight from the books. For instance, Harry's anger problems which Murphy confronts him about. Ok, sure he was influenced with mind mojo to start making his anger more of a problem, but he also realized that it was a problem he had and it was affecting his use of magic and whether or not he used that magic appropriately. A small corruption, but if it hadn't been some kind of corruption it wouldn't have been worthwhile to Lasciel, and it was self maintaining, and could become worse without further influence on her part once she started the ball rolling. Another instance, without mind mojo possibly confusing matters, Harry's fear of losing his fire magic, if he failed to use it once it would become harder to use in the future and slowly become impossible altogether.
An example Harry has noted about wizards in general, if you have magic you tend to start trying to solve problems with magic. It's behavioral reinforcement. Using magic is a behavior. Using magic for destructive ends creates reinforcement for that sort of destructive behavior. Which is just like saying that killing someone with magic is going to reinforce the behavior of killing with magic.
Or, without the judgement that such tainting is a thing to avoid, 'Will [these results] by magic and be tainted in your soul'.
. This quote applies to -any- repeatable action. That applies in game or out, it's simply a matter of degrees and whether or not "taint" is the right word.