I think there's a lot of idealism being spouted here. Tickling isn't my only kink (it's only my latest haha) but I've learned in the past that whilst the very best of friends will accept unusual traits, otherwise "good" friends won't, and I don't think it's fair to assume that someone will. There are plenty of people that I consider to be friends because I work/worked with them, and we hang out together, but I wouldn't tell them my secrets, nor would I expect them to tell me theirs.
If you can afford to throw away anyone that isn't a "close" friend, then fine, but for me, I'd rather not tell everyone and anyone about my kinks because it makes my life a lot easier, and I like some of those people. I may not entirely trust them, but they're fun to spend time with.
However, I do agree entirely that "tricking" someone into indulging your fetish is a horribly bad idea. Arguably, it's worse if they enjoy it, because then there might come a time when the subject comes up again, and you could be forced to admit that you deceived them into it. I've no idea what that's like, but I can't imagine it goes too well. However, a little playful teasing/tickling isn't in the same boat as tricking them into a full-blown session, and for me, as someone that's only developed a tickling kink since the start of the year, I would have freely prodded, poked and tickled people until the cows came home last year if the mood took me because I wasn't so self-conscious about it.
Having a kink doesn't make you a freak, but obsessing over it and creeping about it does. Much like how there's a line between being "confident" and being "arrogant" about how good you are at something, where it's open to your own actions, and the interpretation of those actions by other people. It's not something to be ashamed of (and certainly not something you need to be "cured" of) but it's something that you need to be careful with, because other people aren't always tolerant. Even on kink sites, people aren't very tolerant of fetishes that they don't share, so sitting someone down and saying "I have a tickling fetish and would like to tickle you" can be pretty intimidating for the other person. Of course, it can work, but it does seem like jumping in right at the deepest end possible, and you're much better off building up to it instead.