1. I don't want to be picky and detail orientated about the stuff I eat, I don't want to go to restaurants and make sure it's fine and then while shopping go through the details of every food item that I buy. It's... just not a time investment I'm really into. 2. When I cook I want to be able to try everything, I still do make vegetarian/vegan dishes (and I will happily try out those weird vegan-meats to see what they're like) but I want to check out other things. Also it's weird, but I actually like trimming fat off of meat, I realize that's probably bad, but I like it.
If I lived in a more Asian country where vegetarianism were easier, I'd do it no problem but I live where I live.
I never really bothered with the whole "vitamin" argument, it's only relevant when there's a massive deficiency and overdosing on them is a much more real problem.
I'm not a vegetarian because I like the taste of meat, plus it's more practical than limiting myself to something. Plus it adds more variety to a diet which seems far healthier than just doing vegetables. ---