I too don't care what consenting adults do, but when you are raising kids and grandchildren, you don't want them getting the idea that it's "normal" (Sorry S.J) or perfectly alright.
I don’t know about you JLM, but I want my grandkids (when they come along) to grow up knowing that there are different types of people in the world, that everybody deserves equal rights in spite of their differences, and it is not upto us to judge people and separate them into categories such as good and bad.
I would like them to be exposed to everything in the world, at age appropriate level, of course.
That is how we brought up our son, we taught him that tolerance is the greatest virtue, everything else flows from tolerance. We did not try to shield him from the rest of the world, but let him be exposed to the world (again, at age appropriate level). He has turned out to be a fine young man, in the third year of medical school.
Tolerance is good, but perhaps thoughtfulness and consideration are greater virtues.