many times internet trolls are just angry and are acting out their anger against others in an imbalanced way. usually their logic is broken and they will claim that the logic of others is broken. in fact, they will often attack and insult others, claiming that their target is doing something that, in truth, they themselves are doing.
the troll may or may not be aware of their reversed and denied situation and since unconsciousness is always part of the problem, the only solution is to increase consciousness. the challenge is that many trolls simply do not want to increase their consciousness and will deny the truth at every opportunity.. this may result in cases where we find that we are communicating with someone who claims to be 'superior' in knowledge, understanding and/or intellect, yet who rejects all opportunity for them to learn. in these cases, the minds of these ones are stuck and held rigid into dysfunctional patterns that will only heal through their own intent to heal and nothing else.
therefore, in these cases - it is entirely appropriate to ask whether we can help them or not and if not, then to simply block them or move away from them. a balanced community cannot be built by people who do not intend balance.
for extensive information on trolling - including 'professional' trolling by corporations and alleged 'govern-ments' - this is an excellent piece that originally appeared on cryptome:
my advice is to be a bridge, not the troll that lives under them ;)