Firstly, I think it completely aligns with libertarian principles to regulate environmental impact. If a company pollutes the airs and rivers, that physical affects everybody.

Secondly, yeah, it is sad that many consumers will turn a blind eye to poor working conditions and environmental impact ... but I do think there is a limit. And honestly, most of the big companies in our nation are making some attempt to improve environmental conditions, probably because they know that some people will stop buying their product if they don't. It's not a lot, but I think the fact that it's happening at all is some proof that companies can certainly be pressured into doing the right thing without legislation.

What I like about the free-ish markets is that it at least gives you a personal choice. If you don't want to support a business, you don't have to. It sucks if other people support it, but let's be honest, if like 50% of the country wants to support a business that you don't like, then what can you expect?