That is a generic explanation; rather like saying that a bridge collapsed because the inspectors didn't do their job.

For specifics, I could say "read the Sequences", but I'm sure you have done already.

How often do people talk about preventing earthquakes or tsunamis?

It seems to me that people talk about it to the extent that they have ideas for what we could actually do about it -- which is not a large extent. Earthquakes and tsunamis are huge, and we, even with our technology, are tiny. People have in fact considered what might be done to relieve stresses in earthquake zones, but haven't come up with much. It's easy to say that if they weren't in such denial about death they find a way. Too easy.

Maybe you could lubricate the tectonic plates so they roll more smoothly, or dissipate the tidal wave before it reaches the shore... Now, doesn't that sound like a child's response to a disaster? Not just helping the survivors, but naively wanting to stop it from ever happening again.

Wanting, with nothing more, is indeed the response of a child, a child that has no idea what would be involved or how to seriously set about finding out, and expects the big folk to take care of it.