How can you say they "clearly were not"? I think the opposite is quite clear - the main components survived the earthquake just fine.
The problem right now is the lack of power. The pumps are run on electric power, and as soon as the earthquake came the power plant itself shut down. So now you need external power to run the pumps. The power infrastructure failed and no other power plants could power these pumps. So they switched to backup generators, which were then wiped out by a tsunami. Then they switched to batteries (which worked fine, until they ran out). Then they brought in backup generators, which failed. Now we're onto pumping seawater in.
If sea wall had been 50' high instead of 30' high (estimates), the generators would have survived and we wouldn't be hearing about this. If the batteries were more than 8 hours we probably wouldn't be hearing about this. If the external generators worked, we wouldn't be hearing about this. Those are the only mistakes.
Compare that to Gen 4 reactors being designed today - no pumps required to circulate fluid. If anything we should be building new plants because if this had happened to a Gen 4 the fluid would be cooling the reactor even without power and none of this would have been a problem.