When did "conservatives" ever support the kind of "civil liberties" like drug use, abortion, pornography, etc.?
When did "conservatives" start supporting draft evasion, desertion, and the abolishing of the Uniform Code Of Military Justice?
When did "conservatives" start calling for the end to immigration laws and the acceptance of all immigrants legal or not?
What "conservatives" do you know that call for an end to child labor laws?
They aren't civil liberties. The libertarian and classical liberal approach is based on regulating rather than outright outlawing. We approach it from the tried-and-true angle of if you drive it underground you cannot control it because it is out of sight. Somethings like kiddie porn obviously have to go completely, but I think you get the idea. If drugs go underground the Pablo Escabars control its distribution, not the state. Same thing with abortion. It'll be done either in alleys or by doctors getting paid lump sums of $50-$200k per operation.