Ditto me on this.
DISCLAIMER: Yes excessive walls and quote wars can be detrimental to the game.
That said. I think some back and forth or 'case making' is necesarry.
-For one, not everyone thinks the same way, and enlightening other town members to why XXX is scummy can be beneficial.
-The second aspect on the "scum will sheep wallers"...Well so what? Then analyze how the sheeped. What arguments the found strongest. Why they didn't agree with the opposing arguments. It leads to analyzable reactions and further inquiry.
-"Can create a veil for scum to hide behind" (this being one of the wallers in discussion). Yes, and quite effectively can be ruled out as TvT. This requires the town person to pull out of their tunnelvision and end the war before it becomes to excessive. Once A makes their points, B makes their points (maybe a little rebuttle)... there is THEN little reason to continue a back n forth. Whereas asking the populace their opinions on the matter can yield better information.
-To conclude if everyone only ever rights in 1-2 liners there can be little information attained. Yes I love initial gut reads, and seeing peoples reactions. But its hard to recall how people reacted (or how your gut even felt about them on pg 15 when the games now on pg 115). So imo, it must be a happy median.