Why are Trolls not blocked

Thats it. Why are the obvious repeat trolls not blocked from using this site by the mods?

Whatever are you referring to?
A lot of people get accused of trolling at some point. The internet would be a ghost town if everyone did that.
@jond  & @dwmaggie.....because the listeners aren't particularly perfect, either....;)
Due to whatever another may be claiming, or not...

The problem with an 'open forum', one could point out...is that it's Open.

One can agree...or not.

Ain't it grand! *VBS*
This is one of the rare threads that is a troll.