That is, I'm OK with being woken at 0200 to try to understand and if appropriate fix or recover from a disaster only so long as if I'd suspected this might happen the people expecting me to be awake at 0200 would have given me the resource (money, people, whatever) to fix it. If I feel like I don't have that support, I'll only start looking at your disaster during my working day.
My impression is that ISRG pays a lot of attention to preventing disasters, so if I worked for ISRG (not very practical since they're based on the US West Coast and I live in England) I'd be comfortable taking a call in the middle of the night to fix things.