No politician – not even a libertarian one – can be trusted. Once a politician gains power and is faced with the temptations that are thrust upon them daily, it is only human to succumb, regardless of whether they ran on a good platform or not.
The only hope for lasting change is to convince the masses of libertarian ideas. Education is a more reliable tool than activism, because there is always an issue of trustworthiness when dealing with libertarian politicians.
Any libertarian party should prioritize the education of voters, rather than trying every trick in the book to gain votes for fallible human beings. They should not seek electoral success, so much as spreading awareness of an alternative set of ideas. Unfortunately, compromising principle for the sake of expediency is where the American Libertarian Party has gone wrong in recent years, according to its founder David Nolan.