The only libertarians I have known have been former Democrats. Even the Dem Party requires too much in the way of responsibility for their taste. They are liberals who do not want to pay taxes.
I know a lot of Republicans who are former Democrats, who don’t like paying taxes. Your point is?
I know several libertarians. I spent many years as a dues-paying member of the Libertarian Party, although I drifted away a few years back over their preoccupation with the War on Drugs. Neither I nor my other libertarian friends ever were democrats, nor were we ever in favor of big government.