You have to understand that the extra money payed for gas is not lost! The money has gone somewhere else, but it isn't lost!

This means that the people who get the money (the oil exporters) can (and will) spend it back into the U.S. economy (or buy bonds). If they don't the dollar would not keep its value. So this means that the money comes back into the U.S. either way!

Only if extracting the oil requires more manual labor (more people to extract a barrel) the economy will be hurt! But since you hear every company screaming that they can not find qualified people I think that the increase in people working in the oil sector is relatively limmited (any data on this?)

Since the dollar is steadily dropping in the past years, that money is not coming back to the us, apparently.

How will employing more people in oil extraction hurt the economy?

But we all know some of that gas money goes into the economy right... when terrorists funded by it buy fertiliser, diesel (at $3/gallon!), and cars, then tons of money ends up coming from insurance companies' portfolios to pay for the healthcare of the injured. And portfolio money comes from the gas prices too!