I think it's better that there are no animals living in terrible conditions and being slaughtered in terrible ways. Too often in the meat industrie one or both happens.

Now you can eat meat from animals that had a nice life and a fast dead. That would make it okay for me to kill them - because its their life I have problems with, not the fact it ends.

Then there is also the whole climate and environment reason to not eat meat, or eat a whole less. It saves a ton of animal food (that can go to humans) clean water, space and CO2. But that another argument, which for some vegetarians is a more important reason and for others a less important reason.