Why Lion-O is a Horrible King

This will have spoilers, but as it's already aired twice, I'm not going to hide them behind a cut.

I just started watching the new Thundercats. I've finished the first three episodes. I had to stop to rant at Lion-O's stupid decision! I don't know how the cats rose to be the strongest race/society on this planet if this is how they think.

So their palace and city and apparently entire society is destroyed. Lion-O's got two people and a pet with him. So what do they decide to do? Either A) Run off to kill Mumm-ra in revenge or B) go off on a quest to find a book which may or may not exist. Didn't occur to any of them that maybe they ought to look for survivors? That maybe your first priority as king is to protect your people? Find them safety, food, water, shelter? And then start to rebuild?

Of course for all they know (since they didn't look for survivors) and all we know, there are only two female cats left alive on the entire planet. In which case, they might as well go off on whatever fool quest they want, they're doomed anyway. Unless that book is going to tell them how to interbreed with the lizards or fish on the planet.

Even if Cheetara and Wily Kit can have many, many litters, several of the little group are related to each other, so their genetic stock is not very diverse.

Seriously, dude, LOOK FOR SURVIVORS!! You're going to need them!!!