Because even in cases where cars have hit emergency vehicles, it's because the software didn't see the vehicles at all and just continued driving straight in its lane. Whatever flaws the Tesla vision system may have, the idea that it is programmed to deliberately seek out and crash into emergency vehicles seems pretty far-fetched (much less that it would mistake a person wearing a red coat for an emergency vehicle and therefore attempt to crash into it); I assume this is why people are downvoting you.