Ignore list are for the weak. .... That comment alone may add me to someone's list here, but it is true.
I have self control and can weed through the junk and filter in the useful things that come along. Just because X person maybe a complete a**, doesn't mean once in a while he / she may not having something of value and even offer something educational. And if you ignore them, you'll miss that.
So yes, I believe ignore list are for those that are weak (those without self control) and limit themselves from thinking outside the box.