I am sure that there can be many types of reasons to choose the ignore, I just wonder if for the most part it is used to uphold our ideologies so that we do not have to confront our confirmation biases.
Well, each poster has different reasons for using the "ignore" function, of course, but that wouldn't be mine. I've only had a very small number of posters on "ignore" & it's generally been for their posting tactics
or offensive online behaviour, rather than a response to their views. (Sometimes they offer very little, or nothing at all, in the way of arguments or fresh insights to the discussion.) Like, for example, a poster who repeatedly attacks particular individuals in an abusive or offensive manner. Or a poster who "floods" particular threads with irrelevant mumbo jumbo, with the purpose of disrupting & deliberately undermining the flow of the discussion. Or a poster who continually responds with stock cliche's in response to other peoples' arguments. Those sorts of things.
That's how I've used the "ignore" function in the past, but I haven't done so recently. Now I tend to scroll (very quickly!) over those sorts of posts. Pay Little attention to them at all.