Actually, I find the "innocent people can be killed" an incredibly stupid argument. Here it is why:
At every big construction (bridge, dam,etc.) it is pretty much a given that workers are going to die in accidents. Do we stop building big things? No! We try to avoid these accidents by applying more safety, improving things, working on perfection. And there are actually big structures built without workers dying, so the answer is working on safety and not abandoning projects.
Just for educational purposes, the Hoover Dam:
"Construction deaths
There were 112 deaths associated with the construction of the dam. The first person to die in the construction of Hoover Dam was J. G. Tierney, a surveyor who drowned while looking for an ideal spot for the dam. Coincidentally, his son, Patrick W. Tierney, was the last man to die working on the dam, 13 years to the day later. Only 96 of the deaths occurred during construction at the site."