What the h*ll were you thinking?? We are sitting in FWA this morning with Level 5 coming inbound from the west, holding for the wx to clear when we hear SA call for taxi. So this Saab goes out to runway 14 (winds favor 5) so they can try to beat the cells I guess. Well as they get ready for departure, the winds shift to something like 290 at 20+ kts, giving a huge tailwind for 14. Not to mention the heavy rain bringing the vis down to 1 mile or something, lots of lightning, a nearly contaminated runway (that much water), and possible w/s. We expect of course they won't go anywhere, but lo and behold there goes the Saab down 14 trying to takeoff. I was stunned. Thank God that whatever happened to make you abort did, because we were waiting for a worse outcome. WTF???? Come on, use some friggin common sense! All we need is another regional incident or crash because of poor judgement.