This is what comes of "fishing expedition" intelligence gathering. Long lists of the merely suspicious are lumped together with the genuinely dangerous. Everyone, including law-enforcement, knows that the overwhelming majority of the listed are harmless, so they dismiss the value of the lists. And what happens when a tragedy such as this occurs? Why the bureaucrats dig harder and add more names to the lists, of course, what else?
Reformists are in the lead in Iranian parliamentary elections (dpa)
from the article: French reject charges of inaction in Toulouse terror