When thanos snapped the infinity gauntlet, he killed half of the life in the universe. Cows and plants are life. So wouldn’t we still be left with the same problem he was trying to solve?

This is why stupid idiots shouldn’t be given any power.

Humans constitute .01% of all life on earth by biomass. If he was halving all life instead of all sapient life then nothing would have happened but anticlimatic confusion. though that would be hilarious. Your gut bacteria outnumber the cells that compose you. let alone the ones in the environment.

No because

He wanted to balance out the planet

He used the Soul Stone to make the connection, IIRC, so maybe they just don’t have souls?