Not the person you're replying to but I'll answer anyway. The theory that the Charlie Hebdo attacks was a false flag attack was raised by Paul Craig Roberts of the Reagan administration.[1]

I find it a pretty incredible claim, but it's coming from a somewhat credible source regardless. Coupled with the fact that we do know false flag operations have been used and planned for use in the past, it's not hard to see why it's a theory given weight to.

[1]http://www.ronpaulinstitute.org/archives/featured-articles/2...