To the contrary, we (as a society) do worse things to animals when we aren't able to actually see it happening. If I were a boar, I'd rather have lived a natural life and suffered a tragic end than have been born and die in brutal slavery. Working in a factory farm setting is known to have a negative affect on the psyche [1]. The small-time farmer who just ships live animals off and the butcher who is cutting up an already-dead animal don't have this problem. To me, this signals that we do in fact see cognition in these animals, and ignoring it causes us to ignore that cognition in humans.

[1] https://journals.sagepub.com/doi/abs/10.1177/108602660933816...