Unfortunately, even in our current "enlightened" age, there are people out there who will use such information against you. Not all kinky peeps - tickling, BDSM or whatever - have the luxury of being able to be 'out' and not suffer consequences.
[rant on]
Speaking from a North American societal perspective, sex in general is still something to be 'ashamed' of, rather than being treated as a normal, healthy adult human function. Having it treated by certain groups of people (read: religious right) as something that 'should be confined to the sanctity of marriage' and within certain restricted parameters of activity/positions creates anxiety, paranoia and what I call the "holier-than-thou" attitude.
When kink - in ANY form - is thrown into the mix, all hell can break loose. There have been cases where people have lost their jobs/careers or families and had their reputations ruined all because some narrow-minded jackass went digging into information that was none of their business and broadcast it to the world. The reaction expected is one of "shock!" "horror!" "My God, what sex fiends!" et cetera because many people can't (or aren't supposed to) handle ideas that are outside the proscribed norm.
People are scapegoated and humiliated, their right to privacy compromised and for what? For doing something that half these hypocritical jackasses are probably indulging in themselves?
[rant off]
Ahem...however...
🙂
There are certain areas where things are beginning to change. There are kink-friendly professionals popping around the place (example: psychiatrists that won't diagnose your kink as something abnormal). Groups and events are being held in open environments (think Folsom Street Fair or the recent Vancouver Pride Parade).
Artoo's closet analogy hit the nail on the head. Kinky people are effectively at a point today where gay people were about 20 years ago. Things will (hopefully) change for the better.
Getting back to the point - tickling seems to be seen as a 'lighter' fetish because of the connotations of the activity itself. It doesn't involve conventional pain, it's something that can yield silly and amusing reactions and it's something most of us used to do (or have done to us) as kids.
From a personal perspective: I don't feel the need to broadcast my predilections to the world at large, but I'm hardly keeping it locked up, so to speak. It's just part of me as a human being (same goes for all of us). Not to mention that being somewhat open about it can effectively pull the teeth of the opposition.
Just my 4 cents.
😀