Hanlon's Razor does not apply. When you can reasonably forsee existential risk, and then don't do anything to mitigate it, or selectively filter for the people most risk blind to it such that you can keep on trucking til someone else is forced to stop you, that isn't stupidity. That is premeditated malice.

If you deliberately refuse to even entertain the reasonably foreseeable, it can be forgiven on the scale of a toy project, but when it gets to the point of trillion dollar resource sinks, it is long past time to have sat down and had a long think. It is harder to maintain a mind state in which not doing the right thing is the way ahead, and the real right thing to do is to do it wrong!

Finally, even if Hanlon's Razor is applicable, why in the name of all that is holy are you leaving the issue in question in the hands of people proven incompetent to handle it unsupervised?

Easier to file it under malice and handle the party in question as appropriately malicious until they establish a record of trustworthiness, transparency, and care.