Train seat stess - Aisle Lurker?

This should become a public transport site not a dropbear jenny site.
I'm just wondering why people sit on the aisle side of a 2 seater when they have the opportunity of sitting next to the window. I mean, are they scared that they will get caught behind someone? Miss their stop? Even once a train arrives at a station, it's there for a good 30 seconds, that's lots of time to get to the door.

I'd understand if you were distracted and you just sat on the end, and then when someone else came along you just moved to the window, but why stand and let me in to sit back down in the aisle?

That window seat next to an aisle lurker is actually less desirable than taking an aisle seat on a 3 seater (with someone already at the window). Because naturally you think the aisle lurker is a weirdo. Almost as undesirable as the centre slot on the 3 seat, but that's obviously the worst slot.

I wonder if I could just hold onto the lurker. No! You can't get off! Now are you stressed?!? Maybe talk to the lurker, try and distract them from their stop.

Or I guess I could just ask them why - but that would be too easy.