Your math seems a little off there, or maybe just a typo--I get slightly under 1 in 10,000--but you are correct that the 737 Max crash rate (~1 in 250000) is much worse than other contemporary airliners. In fact the only modern airliner with a worse crash rate was the Concorde.
I'm not trying to defend the 737 Max or Boeing, I'm just trying to point out that even a plane which is dramatically worse than any other active airliner is still, in absolute terms, very very safe. Our safety standards are incredibly high and we are absolutely justified in enforcing those standards, but people shouldn't be scared to fly on the 737 Max when it comes back into service.