It depends on your basic outlook on life. If I am in a restaurant and have finished my meal and I see people waiting for tables I will get up, if I am on a train I will switch seats so others can sit together. One time I was on a bus, it wasn't that crowded, I sat in the first row on the right hand side just behind the driver. A very tall man asked if he could have aisle seat, said it was the only one where he could have leg room.