Ther’s non American libertarians but I think they’re more common in the US
A Libertarian society might lead to some more conservative ideas but I don’t think it’s completely incompatible with progressive ideas, a libertarian doesn’t have an issue with gay marriage etc so I think there’s a clear distinction there
They don’t believe in social conservative ideas though and their other believe don’t really classify as conservative
Idk maybe people thought it was too basic or trying to attack libertarianism