Of course our governments have not been 100%.  You sure don't need to convince me of the flaws and overreach of government.

However, we're not just talking 1 or 2 studies here.  It's been studied ad nauseum by government after government and many levels (federal and state).  And they all come to the same basic conclusion -- as long as it's done correctly (and there are a myriad of precautions in place to help make sure that it does), it's a safe process.  

Does that mean that there will never ever be an error, or a pipe that fails, or some other exceptional failure?  No, of course not.  But it would be ridiculous to apply such a standard.  The gas line into your house could fail too. Or the electrical lines. Or the water lines, or sewer lines.  Nothing comes with a 100% absolute safety guarantee.