I do this all the time. It's actually one of the reasons I blog: to keep track, in easily searchable and keyword-indexed format, of the reasons that led me to hold positions. It's surprising how often I've found myself searching back through the archive to remind myself of what I'd concluded about something, and how often I curse myself for having arrived at some position before I started blogging.So what you optimally, rationally, perfectly objectively do is allow yourself to forget everything you know about A including all the reasons that justify your strongly-held views on A and to just make an indelible mental note that “The right-wing position on A is the correct one no matter what anyone else says and no matter what evidence to the contrary should come along in the future.”The reason this is the rational thing to do is that you have scarce memory space. By allowing those memories to fade away you free up storage space for information about issues B, C, and D which you are still carefully collecting information on, forming an objective opinion about, in preparation for eventually also adopting a well-informed dogmatic opinion about.
But I do enjoy that rather a few of you come along for the ride.