We don't condemn their lifestyles, we condemn their unnatural acts. Sodomy is intrinsically evil. No one has a God-given right to engage in acts that are intrinsically evil.
You like that phrase, don't you ?
There are lots of other descriptions I'd give it: wrong, stupid, nasty, dangerous, unpleasant, unsanitary, and on and on.
Have you ever read C.S. Lewis's Perelandra ?
Now THAT contains a good description of "evil".
To be honest I do not get a good feeling when I think about the things my cousin and his partner do in their bedroom at night but he, I and perhaps even you may not like what many straight couples do in their bedrooms at night.
But the bottom line is that as long as both people are willing participants of of legal age the activities are legal.
Although sodomy may not be your cup of tea, you must concede that the term covers a great deal of ground including many things that most married couples have at least tried. I for one am not willing to condemn all who have committed sodomy as evil and do not want legal authorities in my or anyone else's bedroom approving and disapproving of what is done.