Technically isn't he just squelching other street artists freedom of speech and replacing it with his own? I kinda like Banksy's art, but he does his work in a way which falls under vandalism, but isn't much different from what this Gray Ghost does.
It's the obesity epidemic which has spread to Canada, and there is not enough weight distribution in the middle so it's putting a lot of stress on both ends of the plate which is the planet Earth.
So what would be the ideal things to do? Do nothing?
Remember: Pillage, Then Burn
Chocolate, XL.
Also, in regards to Banksy:
http://io9.com/5660640/banksys-special-simpsons-opening-shows-unicorns-and-clones-are-harmed-in-the-making-of-the-show