Our civilization has been prevented from leaving the earth by our own silliness
Bullshit : energy and distance requirement belie this.
Look at the energy we have to expand to get out in LEO now. Even counting that and assuming you have a refuelling station , look at those requirement to go at 0.1%c speed and have enough fuel to brake. Even getting something like 0.1% C would be difficult. And at the distance we are speaking 0.1% c means thousand of years of travel. At such timescale, the GRB would still be able to wipe full quadrant out. Let us not get misty eyed, there is a lot of obstacle to going out there, and IMHO many people vastly underestimate the requirements. Technology helps us access more better energy source, and utilize that energy better, or make stronger material, but it does not remove the time length and energy requirements.