You'd hope that there'd be mechanical, non-hackable safeguards in place to prevent obvious over-pressure situations. Why would any part of the system allow a serious over-pressure that would result in catastrophe like this?
There are, but one of their safety mechanism is that excess pressure will lead to venting and that in turn can lead to fire if it happens enough. A tiny bit of venting is harmless but a lot of it over a short period of time can cause dangerous concentrations of gas mixed in with regular air, and that is a very nicely combustible mix.
