“No they aren’t, any politician promoting polygamy and homosexual marriage would not be a conservative, and any libertarian wanting to forbid them would not be a libertarian.”
To not desire to put the law against something, is not, on an individua basis, a desire to “promote or advocate” something as morally right, or what one ought to do.
For example: The law permits people to smoke cigarettes. I think it is not only bad for their health but morally wrong, but I oppose the law making all cigarette smoking illegal. That is not a postion that seeks to promote or advocate smoking. It is a position that respects limits to the law, if Liberty is to be protected - i.e. Libertarian.
I.E. hard lefty that pushes the radical agenda of the left and thinks that relabeling it libertarian tricks conservatives.
The libertarian Supreme court, i.e. the Earl Warren court, the most beloved court in history to the lefties, despised by conservatives, and fairly credited by them as being the most destructive.