You would not have EDIT, but only DELETE, so you couldn't modify someones post, only delete (hide) them.
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You can ignore trolls by simply not responding. They can write bullshit posts all they want but the beauty of it is that they aren't stopping you, the logical human being, from posting your ideas as well. Why give OP the power to delete every post that he doesn't agree with? It would only serve to shit these boards up even more.
Seems like the easier way of implementing this would be to stop people on your blacklist from being able to post in your topic.
^^This.
The point of the forums is to open up a discussion and let people's viewpoints be heard (seen?).
If this were implemented and people, as you suggested, had to start "rebuttal" threads to a topic if they disagreed with a poster's idea you're going to have multi-page madness and good topics/discussions continuously bumped to page 5. EVERYONE would want to create their own topic to lord over.
Does anyone (or the devs for that matter) really want to read 10+ threads on one single issue? My guess is "ummm........not really" based on the numerous "hey buddy, that thread already exists" posts I see pop up on repeated topics.
Just put the trolls on "ignore" (protip: then it's up to YOU to actually ignore them... if you keep taking them off so you can find out what rubbish they responded with, it kinda defeats the purpose)
Only three types of people should be allowed to delete posts: admins, moderators, and the person that created their own post. Allowing any more is pathetic and defeats the purpose of discussion.