Where's the manners?

Travelling by tube this evening I found myself infuriated (I often am) by passengers trying to get on the tube at a station before letting people off first.

Why do they do it? Probably to try to get a seat before anyone else. And yes, it is tempting, but good manners stop me. Maybe empty seats should be electrified until everyone getting off the train are on the platform. Technically impossible, but I'd love to see it.

Rant over.

Squiffy.