I would not try to attempt to contact that person. If they want to avoid you, they certainly do not want you to hunt them down.

I have people on ignore for a few different reasons. It can be that I find them abusive (especially to groups I belong to or otherwise associate with), that they have been in arguments where I blocked all of them, even those with my own standpoint because I just couldn't stand seeing the bickering, one I have on ignore for a reason I do not understand myself (force ignore)... but no, you don't have to have done anything wrong to be on ignore. Maybe you just said something that is personally triggering to someone sensitive.

I think you should use it as a lesson, because so many people in life dislike us for "no good reason", and there is nothing we can or SHOULD do about it.

I'm not particularly fond of the setup where you cannot reply if OP has you on ignore, it could easily be abused. Also, I don't want to use ignore as a weapon, it should be a tool for me to not see THEM, without them knowing. I have no intention of hurting people I'm ignoring.