I imagine that a bomb in a bottle of liquor is not easy to conceal from a scanner. On the other hand, I can see a laptop "battery" being a great vehicle for an

I imagine that a bomb in a bottle of liquor is not easy to conceal from a scanner. On the other hand, I can see a laptop "battery" being a great vehicle for an explosive hidden in plain sight. There's also immediate threats to think about. If you have intelligence about an imminent attack by a certain method, you can stop it with targeted reactive measures. Good security requires both proactive and reactive approaches.