No, I don’t think humanity is well placed to be responsible wielders of quantum computing. But the thing is, we’re even less well-placed to be responsible wielders of nuclear weapons, or climate-destroying combustion engines, or probably even guns or fire! :-) So with all the more dangerous technologies out there, it would be weird to fret about quantum computers of all things: something that seems unlikely to do much harm (at least if we take care to upgrade our crypto), and that might even do significant good for the world, for example if quantum simulation lets us design more efficient batteries and solar cells.