It's interesting. I'd have concerns about certain fetishes and what they may tell us about an individual.
My bigger concern by far, is when those fetishes become known. I may worry about a scout leader with a fetish. I absolutely would worry about a scout leader who advertises their interest in a fetish.
That attention seeking behaviour of wanting validation for that fetish, to recruit someone to that fetish, to be 'open' about that fetish- that is the biggest red flag of all, for me.
ABDL in your private life? Well ok. Publicly open about ABDL? No position of authority or influence, none with any safeguarding implications, would be appropriate.