This style of "gotcha" holier-than-thou bad-faith arguments frustrates me. One doesn't need to go from being a straight omnivore to a Level 5 vegan that doesn't eat anything with a shadow for changing a diet in large part being a good thing.

Perfect is the enemy of the good in our line of work, what makes diet any different? One should strive to do the best they can within their location, health, dietary framework and ethical choices. It's as simple as that.