I don't think that complicates anything from a policy perspective. If self-driving cars are good (i.e. safer than human drivers), we should be rolling them out. If a small number of people interfere with them or damage them, we should just arrest those people and prosecute them for the relevant crimes. I don't think that vandalism of self-driving cars is going to be a serious issue long term, given that anyone vandalizing them is going to be on camera, plus people will just get used to them and find other things to be mad about.