Tourist, not sure I follow your argument.
if there are just 2 in the argument and one is ignored then no argument. In a thread with many contributors the one that is ignored will probably not add anything of value anyway.
If someone is prone to overly long diatribes then they eat up screen real estate - that is one I have blocked. Or if someone is plain annoying.
Now occasionally there may be a gem, often someone will cut and paste so you see the comment anyway.