The problem is that the EPA has no credibility. They demonstrably lied after 9/11 about the air quality in Manhattan. Maybe you could say that it was a necessary lie to encourage people to clean up, join the rescue effort, get back to work, etc. But now why should I trust the EPA to not lie about Palestine? All of the same arguments for a good lie apply. The people in charge today are only going to worry about the immediate short term risk, and definitely will not care about long term risk- by the time you get cancer, they will have been long out of power.