There are plenty of legitimate reasons to hate Musk. Bashing spacex's safety isn't one of them, because falcon 9 has the best safety record in the history of orbital launchers. They launch astronauts all the time, and have never had a single mishap in a manned flight. They're even the people who are going to rescue the astronauts stranded by Boeing's screw-up, which I suspect makes them the only spaceflight organisation which is going to have safely landed more people than they launched.
Also, a fuel leak doesn't imply something wasn't fastened correctly. If that were the case it would have been leaking on the launch pad. Much more likely something was damaged by vibration or heat during the flight