@Helleofabore
To bel clear, nowhere did I say that I felt it was appropriate. I know what they were doing in IKEA, I understand why they chose IKEA. The point is the transgression.
Do you believe that people are not harmed in being involved in someone else's sexual fetish without express permission?
I believe that it's possible that nobody was harmed by witnessing this. It's clear by the replies here, and also the initial newspaper report which didn't get it right, that most people wouldn't have a clue what they were doing.
Do you honestly think that these people are not sexually aroused by being out in public and people unwillingly and unknowingly participating in their fetish?
I don't know what was going on for these people, and nor does anyone without asking them. I also think it is important not to operate from a place of fear, and "what if...?"
If you stick to the facts of what happened, there were two men in leather dog masks wearing tails in IKEA the other day. If you feel you can sustain harm from that, then that's absolutely your right. I would choose not to be offended, personally, and save that for something harmful.
Where does the line exist for you?
The point is that the line of acceptability is different for everyone. Not everyone feels the same way about everything. No, for me, this isn't paticularly necessary of appropriate, but neither is it horrifying child abuse either.