It gets worse, since in this case it's not even a trade-off between convenience and security. In Sri Lanka they had (and perhaps still have) security scanning at the entrance to the terminal.

As a result people have to bunch up outside the terminal, making them even more vulnerable than they otherwise would be.

Any true improvements would have to come from streamlined pre-screening, e.g. chemical detectors (or dogs?) in the concourse sniffing things out without making people stop or bunch up. Hard to do.