I cannot possibly be the advocate (or endorse) of every post written by every blogger on my blogroll and still have a variety of opinions and political perspectives. In this case, I linked because I liked the aesthetics of the bike design.
I generally don't favor the homogeneous blogroll concept and you can probably see for yourself that there are a lot of ppl there who would have a great deal to argue about.
On the other hand, I have dumped a few blogs for engaging in what I would describe as racist and/or fundamentally dishonest lines of argument when those kind of posts came to my attention. I've also refused to blogroll other well-known blogs for the same reason even when asked to do so.
So, that's basically the Zenpundit blogroll policy.