I think this guy is a complete goob. I understand making physics and science relate-able, but "how will we fight the aliens" and the other bogus topics of his show are such an abstraction I really can't be bothered to take the guy seriously, at least not his public persona.
I could not disagree more; your trying to relate the topics of the shows he is asked to speak to versus the science he does. What you are complaining about is the writing for the show, which he doesn't do. The stories that he speaks of come from the studios, sometimes from we the masses and he tries to answer them. If some of the questions seem stupid and bogus, I would 100% agree with you. But many of those "stupid" and "bogus" topics are exactly what the masses want to see on TV, even if it seems silly to those of us who understand the science.

The fact that someone is trying to popularize science is not something to push away, but to embrace. I love the fact that these shows exist, and some of them that Michio is on are not silly or bogus - some of the science shows he has done with David Green or Steven Hawking are anything but silly but rather are above all of our heads. So some of the shows, sure are dumb. Some of them are fantastic. All of them are about science at difference audience levels, and they deserve our support.
(Michio Kaku fan)