Merely contributing to a wiki is considered blockworthy in the minds of some admins.
Merely contributing an alternative point of view - the whole point of a wiki - is blockworthy in some admin's minds!
I've already said that you have to take appeals into account. Yes, there is the occasional admin that blocks unreasonably, however those blocks don't last long (and in cases as bad as the ones you are talking about, neither does the admin's mop).