Well, this is talking about food waste, not pollution. Even if it rots and doesn't do anything, worst case it's a pile of bio-matter. The land, and everything involved in growing them could be used for actual food though, which could decrease food prices potentially.

Still, it's not a big deal and there's bugger fish to fry, but it doesn't mean it shouldn't be considered. Changing your mindset can make other issues and solutions more obvious.

Halloween food - no.

Halloween plastic decorations, wrapping, costumes.... yeah, we can do without

It's low priority for sure.