people are against it mostly when its done in large quantities on a consistent basis. In such a case it can really hurt the bass population, mostly speaking on smaller bodies of water (small reservoirs, ponds etc) Secondly, especially this time of year (spawn) I see no justification for someone trying to keep a big female bass 5+ lber for a simple meal) If you go to a stream,river etc up north the same views can be said about trout fishing. While those up there hate the bass they will look down on anyone keeping trout. (vise versa in many other places, especially where there are trout being stocked and not wild)
Moderation is key. Hope this helps, I know it was a bit of a rant.