The day before yesterday I had a flight from a non-Schengen country to a Schengen destination with transfer at Helsinki Airport. I was surprised to see that after arrival in Helsinki all passengers who wanted to transfer to another flight not only had to go through passport control - which seems understandable - but also through security control before getting to the departure gates. If you arrive by plane, you have had to go through security control at the airport where you started your journey, so why do you have to go through security control once more before you get on your second flight?
This matters especially when you have bought liquid goods at the original airport within security control area, meaning that you can take it with you in the plane, but at security control of the transfer airport it falls under the regulation for liquids (under 100 ml, separately packed and so on) for your second flight.
So what is the sense of this additional security control?