Which sin is less bad? Adultery was the death penalty for both of those caught in the act by witnesses. Same with bestiality. You could get away with it if you did it in private. Stealing? well you pay back what you stole. Whatever you demanded from someone had to be somewhat to the crime. Considering adultery could infect your spouse and children with STDs, I can understand why they did what they did.
If any of us - just one of the 7 billion or so souls on the earth - Christ would not have had to die for our sins. so may seem to forget that and believe that some of the less sinful are somehow better enough in His eyes that they are free to confer their own Judgement (vs. discernment with understanding that we are also sinners and fall short) on those they deem to be especially sinful.