Tolerance is conditionally putting up with things you don’t like.
Botanists ask how much loss of moisture a plant can tolerate and still survive. In the 18th century, Hungary disfavored Jews, but would tolerate them if they paid a “toleration” tax. In these examples, perceived threats are deemed bearable for certain purposes within certain limits.
Thus, tolerance is contingent, practiced not for its own sake but because it is a means of obtaining other things we want. The core question therefore becomes, tolerance for what?