Can I ask you the same question?
What do you think is the most fundamental reason to criminalize those things?
Perhaps it ultimately goes back ultimately to me holding that a particular God has revealed Himself to me, and such a being is naturally right about everything. This "trickles down" to the statement by Pope Ven. Pius XII that natural Law should be the basis of all human law on the national and international levels. From these two things (which imply a lot of other things of course) I begin being "political" and trying to figure out of the state should do this or what in an ideal state should be punished or not. This process led me to certain principles such as "a good state is like a good father" or "human law should help dispose man toward God."
All-in-all it leads to a very different idea of freedom, if I equivocate I can sound like a liberal (not talking about just in the US sense, to me all Republicans and Conservatives are liberals also), but it isn't that at all, because freedom to me is in God, all else is slavery and death. So a state which promotes freedom will direct humans toward the Lord Jesus who said "whoever the Son sets free is free indeed" and "whoever commits a sin is a slave of sin."