I know there's other reasons but I'll still call them assholes. For instance, let's say the assailant is some Fed plant to kill Midular for whatever reason and they don't what the Minnies finding out. Of course it's possible.
That doesn't make the Fed any less assholish.
...
It is a
very standard procedure for Law Enforcement to keep the results of their investigations mum until they're satisfied that they know all the facts and have interviewed all relevant suspects. This guy carried out a sophisticated bomb/gun attack, evading security and firing at the crowd from a vantage point. If I were the Gallente investigators, I'd be quietly (and furiously) pursuing the possibility that someone with knowledge of the security arrangements had assisted in some way.
And yes, that could mean that the terrorist's accomplice is well-connected politically, but tbh, I don't know that the Federation's detectives would be inclined to hush it up given the huge number of Fed citizens killed or wounded. This IS still the Federation, self-purported utopia of democracy and freedom. It's the
Republic which has the endemic corruption in its government officials.
Unless they've pulled everyone off the case except for the Black Eagles?
Also, really? People are surprised that in EVE, grimdarkhelldeath universe wherein even the
players are encouraged to Do Unto each-other, someone
didn't survive? Hell, in that rather *ahem* Chronicle about the leaders meeting in secret to talk DUST, I was expecting the Empress to try to assassinate the others right there.