No offense but, nobody is supposed to be a vegetarian, our teeth are designed for chewing vegetables and meats.
How long do you think humans have been on this earth? The bible says 6,000 years, scientists say millions and millions. Only within the last 50 or so years has there even been ENOUGH meat to eat at every single meal. This new trend is absurd and unhealthy (hence the outrageous obesity epidemic). Only 100-200 years ago, meat was eaten around once a month, as farms were the main source of food. And during the dark ages meat was eaten even less, only a couple times a year. If people still had to track their meat for days and kill it with a bow or primitive inaccurate rifle, then gut clean and maintenance it, people would go right back to the diet they are supposed to be on. Primarily vegetarian. Very few people would want to hunt enough to eat bacon and sausage every morning, a chicken salad and cheeseburger for every lunch, and a steak for every dinner.
Vegetarianism has been proven to be a supremely healthy diet, rate of heart attacks in males decreases by NINTEY percent. So don't believe the consumeristic fast food chain media propaganda that you are fed day in and day out on TV, billboards, and every street corner.
Just because you CAN eat something doesn't make it a good idea. I could eat dirt fine and well, but you won't catch me doing it any time soon.
By the way, it has already been addressed in this post, that there is no way around the double standard, truly. The issue is HOW the animal dies. Most people that don't agree with feeder fish, don't own fish that require such a diet, as Ken has pointed out. If you could pick to die a painless, instantaneous death, or to be slowly burned alive and digested by acid, which would you pick?