Outside the USA, especially at smaller airports, xraying all the bags is something thats only done to meet the rules. The staff don't care what you have in your bag - if security has a queue, they'll just pick 100 random people and tell them to skip security and go straight through to departures.
Likewise, if there is only 2 people on duty to search bags identified that need searching, and they're busy, then any liquids etc. in other bags will be 'not noticed' so as to not overload the people searching bags and cause queues.
Such things make me always deliberately choose small airports - they're just so efficient compared to airports where security theater is done 'properly'.