Most conservatives or right-wings worldwide oppose psychoatives legalization, why such unanimity on this topic? I find it strange that there is such a consensus. Do you know why?

Personnally I don't know. They pretend to be for individual liberty/responsability while honoring for most westerners the so called freedom, but in fact are more like zealous little control freaks closer to ISIS in their way of thinking...

Only Libertarians get the concept of ownership of the body by the individual... it goes to whatever-sex to abortion to "drugs".