It doesn't seem that there has been a thread on this in some time, and there was a discussion in another thread, so I shall post one here.
The discussion, as it was, was on the percentage of an entire population that is ABDL, so I'll provide my opinions here.
First, however, I'd like to make some requests:
First, please use proper statistics and math where appropriate. If you don't wish to do this, or are going to react poorly at your math being picked apart then this may not be the thread for you, as I intend to have a sensible discussion.
Second, please keep it civil.
Lastly, please try to post intent on content. Posts just to say that you agree with such and such don't really have a point in mature discussion.
So here's my opinion. Please realize that this is based in anecdote, but I'm also not a math slouch and will try to keep it grounded in fact as well.
The percentage of ABDLs, henceforth defined for the purpose of this thread as people who actively pursue acting like toddlers or infants for that sake and, as necessary, wearing diapers for recreational purposes whether or not the former is true, is VERY VERY VERY small.
My rationalizations are many:
Firstly, I look at the total number I have found in my current area, which is very low. For a four-million person metropolitan area there are slightly less than 20 that I've been able to find in any context. I look at this as a low extreme, however...
And then I look at the place I used to live which, within a metropolitan area of maybe ten million people, probably has a few hundred. This is a lot. I look at this as a high extreme, as that place is actually well known for its high ABDL population within other ABDL communities.
So, I will assume, for the sake of having looked at these two, that place A is two standard deviations off, at .000005 percent. That is, 1/200,000, and place B is one standard deviation in the opposite direction at, let's say, 500/10,000,000 or 1/20,000 (really being quite generous).
Now, the other part of this is that judging this in small towns is practically useless. No matter which way they are, be it another town that I lived in which had 600 people, 3-6 of whom were ABDLs at the time that I lived there, and ANOTHER area that I lived in, which had 10,000 and one, that being myself, and 0 when I left, they are not useful results. Without larger statistics, in other words, an estimate is meaningless.
So let's talk it out. Please remember that we need to follow good math rules and, in all algebra, you do the same to one side of an equation that you would do to the other if you want useful results. If you don't follow these rules, expect to be called on it.