Motion sensorship

I just saw a commercial for a motion sensing liquid hand soap dispenser.
The reason they made it is because a pump on a hand soap dispenser gathers germs.

Don't get me wrong, it makes sense, because people don't want to get germs on their hands.

But what doesn't make sense is that regardless of how many germs are on the pump, you're going to wash your hands.
You could have 23894720894728740 germs on your hands from touching the pump, but you're just going to kill them by washing them anyway.