Good. Fit in or get off. Unlike people with disabilities or genetic disposition to being 7'8" or such it''s all about pies. No harm if there is available space but an 'average' person should not have to suffer some sweating pile of lard having to ooze over them into their seat. Obese punters could always lose weight. It's about choice. They choose to eat shed loads of food - ipso facto - they choose not to fit on a 'plane.