Not eating it is much easier than stealing it.
Indeed. But also less effective.
I consider vegans neutral. They neither help nor hinder the industry of animal products. I love this quote by Desmond Tutu:
“If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse, and you say that you are neutral, the mouse will not appreciate your neutrality.”

Can’t say I’m with you. If the top hat shop goes out of business because the demand for top hats dies off, it’s a good thing. It’s one of the few good features of capitalism to have a natural death of that particular variety of waste (the waste of producing beyond demand).
If the consumption of meat is dropping (good!), then it’s even more important for grocers to stock less of it.