Long ago in the early days of the ecology movement, the believers would decry the use of technology to solve pollution issues, scorning the "mere technological fix"--so the supposed problems weren't really the movement's motivation, otherwise fixing them would settle the matter.
I was reminded of this while googling around to see what in the way of wearing advertising people may have done in the past in Second Life, because the search happened to turn up the infamous "impeach Bush" extortionist. He would buy tiny plots of land, put up huge "impeach Bush" signs on them and then offer to sell the plots for a ridiculous price so those nearby could get their view back. When it happened, in late 2005, there was a huge brouhaha. Google "second life" "impeach bush" and you'll get over 27,000 hits.
Now, if you use Phoenix (or its descendant, Firestorm) or Imprudence? "Dang, that's an ugly sign." Right click, remove, derender... done. (At least that's the sequence for Firestorm, my current SL client of choice.) A would-be extortionist or griefer, nipped in the bud.
So... give me the technological fix, please.
Check out Cheyenne Palisades's blog for an example of applying mute and derender to an avatar.