I don't know if it's a good or bad idea to use politics to alert people to ancap/libertarian ideas. What I do know is it sometimes seems to be quite effective. Politics is where people go to hear political ideas and if you're not there, how will new people discover the ideas? I also keep hearing people say that Ron Paul really changed things for them so it seems effective. But perhaps more effective is to ensure we are all talking about the ideas every time we can with individuals in our life who will listen to us.
Discussion
I guess I donโt see talking to people in your life and talking to people by way of politics as mutually exclusive. In either case youโre talking about ideas in hopes they spread. Talking about liberty ideas within the realm of politics isnโt any more immoral than talking about those same topics with your neighbor.
Now if you want to make an argument that talking to people through politics is not the best use of time relative to other things you could be doing, then I think youโve got a much better argument.