Even if one could provide a source that explicitly prohibits knocking out somebody’s teeth (which unsurprisingly, has yet to happen), the argument could still be made that that is only because some people may feel hatred while engaging in the said act of knocking out teeth. However, if I decide that I will not feel any such hatred, perhaps I should still be allowed to knock out others teeth, especially if doing so will help me exercise.
Sam2, both the OP and the above are obviously satirical, but they are meant to bring out a serious point about being overly resistant to applying general principle to specific cases where they obviously should apply.
And as an aside, whatever happened to “Attacking someone for asking a question is an anti-Torah attitude. Don’t do it. Ever.”? Or do you agree that there are indeed cases where the underlying attitude of question should be vehemently opposed?