I disagree, obviously the majority of the people are not affected by this because they are not affiliated to this 'caricature'. That doesn't mean that the feelings of those who are affected by it is not as important, if not more important then of those who ain't.
I do believe that the intentions of some of these protesters are not necessarily for the same purpose as of those who genuinely are feeling hurt by this and it is a shame that these people are using this as a platform for their own good. But on the other side of the story I honestly don't believe that the people that are 'pro-piet' are doing this because they are so fond of the legendary "Piet", these people just want to, as we say in dutch, tegen zere schenen schoppen.. Which basically translates to intentionally wanting to hurt others.