I too agree with the principal here, however, it's not quite that black and white. For one, Let me tell you from experience, kids talk about everything! That may not matter to some, but I would say, for most, that does matter. Secondly, for the average DL, this is far different than a hobby like fishing. Would you leave porn magazines, and sex toys sitting on your coffee table? No, certainly not. Would you leave a blow up doll during on the couch? Not a chance. Would you be open with your kids about how you like to stick condom covered bananas up you bum while playing with yourself? Never.
I am no longer ashamed of my love for diapers. I do have a night time need to wear, but it doesn't change my underlying attraction to them. While I don't go out of my way to hide them from my kids, I also am perfectly fine keeping it all in my bedroom. I'd perfectly content if they never knew, just like I'd rather never know when or how or where my kids masturbate (as long as they stay safe).
Do I care if my family or neighbors or friends etc find out? Some of them, yes, very much so. I'd really rather my coworkers or fellow members of my kids school board not know... Just as I could care less that they are into bondage or foot fetishes or whatever. Its no body else's business and simply has no place in those kinds of situations.
Hopefully this all doesn't come across harsh, I just mean to show that there are very good reasons to keep things in the closet when kids are involved.