Late Boarders and Poor Etiquette on the Late Train

Your inability to get to the train in a timely manner does not create an emergency on my part. Therefore, if I choose to take my time moving my heavy backpack from the seat to my lap (a wet train floor is no place for my bag), you should not huff at me. 

I was seated, comfortably, 20 minutes before the scheduled departure time. Calm down. You made the train with two minutes to spare. Now stop behaving like the universe is out to get you. It's not. Promise.

Cut to 30 minutes later and several seats having been vacated...

Why are you still sitting next to me? There are three completely empty seats close enough that you wouldn't even have to take two steps. Commuter train etiquette would dictate that as soon as a nearby seat opens up, you get up and take it. I do not know you. I no longer wish to share a seat with you. *sigh*