They forgot it's real life they're playing in.

Yes. In real life people don't always follow the blueprint you have going in your head.

I first watched Skyfall with my friend and her husband who's a computer person. He nearly choked on his popcorn in disbelief when Q directly plugged Silva's laptop to the entire MI6 system. I reasoned Q probably had a program installed that he thought would take care of any infection but grossly underestimated Silva's skills.