Indeed they do see things through the filters they have installed, and equally, if a person only sees scientology as something that 'works' they too will interpret and post accordingly. It works both ways Paul.
Yes that is very true, though I think that anyone in cofs makes much more use of "filters" than most ex's.
In fact they are not even allowed to look at information ("entheta") which would throw any doubt on their beliefs so it may never even get to the point of having to be filtered out mentally.
In my own case I do try to remember any positives about my time in cofs as well as the more prominent negatives. Not always easy though.