Is this just NASA being reckless?

In case you wern't aware the "Return To Flight" Shuttle Launch has been delayed twice, the second time was when a fuel guage malfunctioned. This was serious enough to halt the launch so that a repeat of Challenger or Columbia sis not occur. Now NASA says that it will launch even if the guage malfunctions. Is this just a case of NASA being reckless?

NASA ran more than 160 tests but has failed to explain what exactly caused the failure of one of the four hydrogen level sensors that prompted the last-minute cancelation of the July 13 launch.

The space agency hopes to detect the root of the problem during last-minute testing while the shuttle's massive external tank is being filled.

If the problem reoccurs on the same sensor or another similar one and engineers have a clear understanding of the problem, the launch would go ahead as planned, said Wayne Hale, deputy manager of the space shuttle program.

But he insisted that if any other low fuel level sensors malfunctioned, the launch would be called off.

So what does this actually mean? Well the sensors in question notify of when to shut down the main engines (bear in mind that at this time the boosters are long gone). If this happens to early, because a guage malfunctioned, then the Shuttle most probably make it to orbit.

If you know there is a problem and 160 tests cannot isolate it is it really worth gambling wilth a third crew of people?

Full article here