I think fat people would still have a problem with those seats...

Personally I think if you take up more than one seat you should pay for more than one seat. Have you ever had to sit next to a really fat person on a plane? Trust me, it sux.

If you obstruct the comfort of other passengers by invading their space with your body you should get and be charged for 2 seats, not stuffed into one seat overflowing into your neighbor.

At the same time though, I agree that it's bullshit that some of the airlines think they can take those second, already-paid-for seats and give them to another passenger if the flight is full. If you bought the seat, you bought the seat, I don't care whether you're filling it with a child, a surfboard, or a pile of gut lard.

The Airlines have become quite a bit more militant over the years.