Knogz:
Allow me to offer a few thoughts.
First of all, I think that everybody here would probably agree with you on three points.
1. Nobody can blame you for finding the picture of foot torture sickening to look at.
2. Whoever tricked you into clicking on to see it is sick, because inflicting a picture on you against your will is a sick thing to do.
3. In the event that the torture was as non-consensual as it looked to you, that is immoral.
That said, I think there are also two points on which people might fairly challenge you.
1. Just as there are people whose fetish causes them to crave being tied down and tickled, and will enjoy it in their intimate relationships and/or pay big bucks to have it done by a pro, there are also those who have exactly the same relationship with being paddled, being whipped, or having pins stuck into their feet, and even though they're crying out in pain, they desire it. They are masochists, and this is a bona fide sexual variation. Moreover, people who are into this lifestyle tend to be a very self-policing group, with strict codes to keep it safe and consensual.
2. You refer to tickling as "having fun," but there are many who experience it as delightful torture from the masochist perspective. There's a reason why people who want to be tickled (lees) will be the first to admit that they need to be tied up for it, because no matter how much they like it they'll be trying to get away from it while it's happening. And make no mistake, there are plenty and plenty and plenty of outsiders who would call this sick too.
So, in bottom line, I'm saying that you're absolutely right to be offended by being exposed to that picture against your will, but when it comes to the kind of consensual activity that other people like, in a forum such as this, there's a lot to be said for asking questions that lead to learning more, which has nothing to do with changing your own orientation.
Glad to see you back! 
