If the culture is extremely peaceful, then of course we should tolerate them. If they have a culture of extreme love and kinship for one another than of course we should tolerate them. On the other hand, if they have a culture which requires them to wipe out all other cultures, then we must not tolerate them and try to separate them. (Separated they won't be as strong.) We should tolerate them as long as they don't bring physical harm to anybody. (including themselves)
1. All of us are just vertebrates on a ball in space
2. All cultures are fiction/pretend/made-up
3. If your culture over-breeds so that you love death and killing, what you REALLY will find a benefit is birthcontrol.
Then, you can keep your hate for sports teams where it belongs