All the "do as you want" aspects of libertarians would probably come to a screeching halt if the leftists gain enough control. Republicans would usually allow the citizenry to vote on such things, but if leftists get full, iron-fisted control (which they seem to desire), only they will be making any decisions.

That's true, especially among the "don't infringe on anyone's rights at any time". They would likely view it as a 'prevent aggression' or 'give aggression its natural reward types'. What applies to drug pushers applies to those who aggress on other's rights.

https://zeroaggressionproject.org/mental-lever/initiated-force/

https://zeroaggressionproject.org/mental-lever/equal-liberty/

The second link is especially pertinent to the discussion here, in relation to not harming others by your actions.