'Dogs_ears_up', you are not asking silly questions. There is a culture amongst pilots of vigorous debate of the professional issues.
Yes, you are correct to say that if the electricity had not caused the lights to fail the Captain might have landed the aircraft safely.
The issue is that, if there had been more fuel on the aircraft, a landing at that time might have been averted.
Here we get into a real pickle. It is the Captains responsibility to carry extra fuel to cover eventualities. However, the airline is allowed to write a fuel policy which suggests that the carriage of extra fuel should be moderated.
This is the rub. In the UK, some airline management cultures put subtle pressure on Captains to carry minimum fuel.. Some do and some don't. It can depend how resilient you are to peer group pressure. It can also depend on whether you have ever been badly frightened.
I fall into the latter category and carry a lot of extra fuel for fog, strong winds and thunderstorms.
However, even if you carry lots of extra fuel you can still get caught out in extremis. The runway can become blocked or the lights can go out at night just as you are landing having used all the extra gas due to circumstances.
Perhaps we should practice fuel emergencies in the SIM. However, that might lead to pilots carrying more fuel all the time and then the bean counters would quietly suggest to the Board that they do something about it . . .