Who defines what “better” is? You’re a collection of atoms put together by a meaningless evolutionary process. In that sense, “better” is purely your preference not some objective truth. And in this case, some people prefer to kill and eat animals.
We're the universe trying to learn about itself. We have the duty to be best ones we can be. Agree that on the cosmic timescale it's meaningless. On the individual level it's not.
That’s just anthropomorphizing the universe, which cannot learn or think and therefore cannot impute meaning. It is simply your opinion that something has meaning on an individual level. It may to you, but it’s purely subjective.
How do you know that universe is not a giant computing device?
Or you know everything there is about infinity, other universes, how and where where "the playground" is placed (what's beyond its borders), what's the origin/meaning of life and so on?
Everything is meaningless and therefore we can do what we like? Even if it has no meaning to you, are you sure (deep down) it has no meaning for the lives you're taking (with your food choices)?
