In spite of the genius of Reed Richards (and Tony Stark) creating similar problems, as already noted, I suspect this motivated the apparently coincidence-dominated origins that Marvel gave to so many of its characters - Steve Rogers was given a Super-Soldier Serum that, against all logic, was never written down before its creator was killed, while Peter Parker, Bruce Banner and the Fantastic Four all received their powers through unique intersections of unintended exposure to radioactivity and other accidental factors, to the point that, even though all of these sources of their respective powers have since been duplicated, the original stories were all clearly intended to show that these unique circumstances simply could not be duplicated, to preempt any such questions about "Why don't they share these powers with others?" In terms of random side-effects, Stan Lee clearly saw radioactivity as being even better than magic.