The only relevant personal anecdote I have is an ex-vegan friend who started eating meat when she realized that a medicine she used was animal-sourced, that she wasn't going to stop taking it(it wasn't life-saving, but it was useful), and that to avoid eating meat at that point would be grossly hypocritical.
Tangentially, considering that 'grossly hypocritical' seems to be a cognitive distortion of some kind. It is more a 'failure of absolutism' or somesuch. The moral implications of eating meat don't seem to change just because you eat the pill.
Perhaps it was the realization that she didn't actually believe what she claimed to? It did sound a bit odd to me when she said it, for what it's worth.
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous "stupid" questions thread is at almost 500 questions in about a month, so I think it's time for a new one.
Also, I have a new "stupid" question.