That probably should be taught at school. That's the way farms work. Animals are slaughtered so you can eat them.

The reason I think it should be taught at school is first because it basic knowledge. Farms employ a significant portion of the population of most countries, and that's what puts food on the table and keeps you alive. That's pretty important.

Another reason is that school can teach that with a neutral point of view. Not like extremists who will describe any farm work involving animals as torture, and not like the interested food industry who wants you to forget that yes, animals are slaughtered to feed you.

Personally, as a meat eater, I think that realizing that an animal died for your food helps respecting it. By that I mean don't waste it, cook it properly, appreciate the taste, and of course, prefer respectful farming practices as much as you can.