The abuse and slaughter of animals is a primary reason for any to be vegan. But there are the environments being ruined with animal agriculture, so there is environmental reason to take being vegan seriously. Likewise with all the more resources being used for animal agriculture, and all the water, and all the land, for it, and there is the contribution to emissions associated with climate change with the warming of this planet. Having just all whole food from plants is also very healthy for us. Being vegan is done for the animals but all these things as more reason make a strong argument for it. And I found it is not hard at all.
For me its also the fact, that keeping animals requires a lot of resouces, especially meat. So this is a really inefficient way to eat.
Instead of using crops that humans can eat, crops for animals are being used.