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The initial launch attempt was 4/17.

This has been repeatedly peddled by ignorant folk who don't care about spaceflight beyond adding in unnecessary snark but it should be obvious to anyone who paid attention that it was sheer coincidence.

The launch was scheduled for 4/17, 4/20 was a backup window. If anything they delayed the launch to hit 4/20, not rushed it.

what was unsafe about it? I think the biggest health hazard was the dust on South Padre which turned out to be just beach sand.

There was a little more than "dust". There are plenty of videos of concrete chunks of 5-20 lb in weight being thrown over a mile and raining down on the beach.

Raining down with no risk of injuring anyone though. What about the flight was unsafe?