They don't realise that these companies won't move to France, instead they'll move to Hong Kong, or Singapore, and Europe will have lost 100% of the value of having them here.
The government might be stupid, but they aren't so stupid as to underestimate the importance of our corporate tax rate. It is the thing that pulled us from poverty to first world, until it's largess was abused. We should be reducing our income tax to match it, and then we'd truly have a knowledge economy.
As if the French can lecture us, when their banks are as bad as ours were in 2008. If the French didn't have the Germans bailing them out, they'd be heading for bankruptcy themselves.