I think your "by default" is a bit misleading here. This is one paper, comparing pesticides for one pest in one crop. But I guess you are right - Organic is not always better.

But, AFAIK, at least here in Austria, buying organic will at least improve your chance that you get some sustainably-produced food - and animals that are kept in a somewhat species-adequate environment...

But thanks for making me question my assumptions ;)