theres border control for a reason...if foreign hitmen can get into the country, kill someone, and get away with it, whats the point of border control?
[1] https://www.theguardian.com/world/2010/jun/15/ireland-israel...
Harassment of ordinary people for the sake of security theatre.
All that hoopla about liquids on planes originates from America. 9/11 didn't happen in China, so they probably think it's just some foreign bullshit they have to implement, which they do half-assedly.