Shoe bombing is viable, bad luck and basic misunderstanding of weather caused the shoe bomb to fail, not the heroic actions of a passenger or FAM (not that dealing him the beat down of his life was not heroic!). It is a viable threat and you can say it isn't til you are blue in the face and it won't matter. I could make a shoe bomb that you would never notice until it blew up or was xrayed, it would take me about 30 minutes. The threat is there, until better testing procedures can be designed or deplyed, these are the current steps taken to mitigate the threat.

I disagree with your assessment on the ability to transport. The results can be unpredictable, but the opportunity is there. You are ignoring the fact that it doesn't have to be mixed up on the plane, some liquids are stable enough to be transported. Even Nitrocellulose is a possibility because it is reasonably stable. You keep looking at it from a point of view that you are worried about blowing up in the process, most people that will use this type of method don't. A whole new world of possibilities opens up when you don't care about making it through, they are willing to do things that scientists say are impossible because they don't care. As for putting the stuff together on camera in a government sponsored video... Honestly? Have you lost your mind? Every halfwit high school kid and college kid would make the same bomb in the same way and we would have a base stupidity contest to see which group lost more hands or people. That would be irresponsible and then the backlash would be epic. The lawsuits after a month would break the government in half. The LAG rules are here for the foreseeable future due to the lack of deployable tech and the cost of the testing equipment.