We think considering the risks we take as founders, being taxed 32.5% (the current rate) is already quite enough. But more to the point, investors who make do with this kind of taxes on their return will never accept an increase to 60% and will by and large invest somewhere else, effectively killing off funding for startups in France. That's the whole ecosystem we're trying to protect here.
Maybe VC funding is not the best way to fund technology.. just throwing that out there. Maybe France should figure out a different way to fund technology than VC.
If France cannot figure out an alternative, I would say that killing existing funding is bad...