I guess you could say I have a form of incontinence. I have some pretty inconvenient IBS D and I'm either rushing to a toilet most times during its most intense flare ups or uncomfortably struggling to hold it to avoid making an embarassing mess until I can conveniently find a toilet. It's not fun, but wearing diapers full time would make it a hell of lot more convenient to deal with, I can tell you that much. In fact, I probably should, but may have to purchase my own supplies out of pocket and I cannot currently afford to do that so I'm stuck in a sort of inbetween position where I could technically survive without diapers and pass as a normal continent person, but it's just really inconvenient to do so. It's not impossible, just incredibly inconvenient and the inconveniences of managing the IBS with diapers in my own internal logical deliberation are concluded to far more manageable to deal with than the risk of an embarassing unprotected mess and the pain/discomfort of struggling to hold it which is equally unhealthy. The choice is obvious. Faux-incontinence, laziness, call it what you will, but the fact is treating my condition as full blown incontinence and managing it as such is the most logical option for someone in my position, better safe than sorry.
As for the "fakers" I don't believe they are relevant in the grand scheme of things and there are ultimately much more important matters we could concern ourselves with instead.