I think that if I do some opposing viewpoints then no one can accuse me of bias.
There are some books that i wouldn't care to do at all, though. E. g. One of the most heavily downloaded books at the Internet Archive this week is an anti-semitic rant, with the usual conspiracy theory about world domination. It's badly-written, poorly-argued and incoherent. I can't work out why anyone with anything approaching a critical faculty would want to read it.