Here is why...
I have never owned a car and bike everywhere and I also basically just eat peanut butter+jelly/ cereal/ 'rabbit food' as my old HS XC used to call it - and try to stay alive by also drinking kefir. This is all because I am cheap and lazy and increasingly set in my ways.
So I do not really have a decrease in my already low quality of life by sacrificing meat or not driving, and in fact I think biking increases my quality of life.
I really don't get the need to eat all this meat though. It's alright, but there are just as many delicious things that aren't meat. And if you are eating meat all the time that's not all-that-natural and frankly kind of gross.
Lastly, that chicken or burger or bacon (ok, bacon is delicious) came from an animal that suffered a lot for your increased quality of life. Is the trade-off really worth it? I think that if you think it is because you are a human, then you are either not thinking about what you are doing or you are and are very cruel.