Did I or did I not mention "dip and drink" as an option in the next paragraph in the same post?
In my mind filtering is a risk minimizer, just like "drinking smart" is a risk minimizer. Do you really need to drink smart when hiking Whitney? Having had giardia, and not ever wanting to have it again because it sucked really bad, I decided to filter my water, to reduce the already miniscule risk even further. The fewer giardia cysts that I ingest, the better, that's how I look at it. Even if that's illogical, irrational, stupid, whatever.