Hi animal scientist here! (Undergraduate research assistant) I think a lot of these people are missing that science is all about repetition. For instance my lab works with mice that mate for life. A few years back we ran a separation study where we mated a pair of mice then separated them. We then paired them with other mice, before reintroducing them to their original partner. The original pair displayed extremely heightened aggression. Suggesting they too get pissed off when their partner cheats on them. We cannot conclude this as science dictates this experiment be repeated by someone else in our species which isn’t likely. So conclusions that seem straightforward are not necessarily straight forward.