Switchabesusie made some valid points about beaches and public swimming pools (and I agree, health considerations for others should keep a diaper wearer out of the water), but those aren't the only two places a DL could wear his/her diaper. And wearing does not necesarily equate to wetting or messing. A lot of the fiction concerning this occurs in shopping malls or at city parks where there are no pools, and it's said that art imitates life.
As to publicly and noticably wearing or using a diaper - I really don't know if I would or not. For me one of the reasons for AB/DL play is the attention my partner gives, and I'm not interested in anyone else's attention in that arena. Another reason I enjoy it is because it *is* something most of society frowns upon. Or would if they knew about it. Playing an illicit game can be part of the fun. Of course, there is the submission and, at time humiliation, factors to consider, as well.
This is not an attack on you or your kinks, Mity Thor, but you list diapers (giving) as one of your kinks in your profile. Have you discussed this with your partner(s) to try to understand why they and you enjoy it? And rimming is not something I'd do, but your profile says you enjoy everything to do with it. I'd never tell you I don't understand your desires; those are for you an your partner and none of my business. As for cross dressing/feminization - well, I get the impression from your profile that you are experienced in the BDSM community, so if you want to understand this one, why not interact with a few CD/TG's at a brunch or play arty and ask them. Although that would be a good beginning, I do understand that not understanding something is not equivalent to wanting to understand it.
Last - If having a few kinks makes someone immature, I'd have to hypothesize that none of the Zity members are high on the maturity scale.