I think people are not getting the point of the OP, however the way the OP has made his post leads to a lot of misunderstanding.
The OP is addressing MOTIVATION.
He is making a point that humans are inherently lazy and there are all levels of motivation within an individual. Some are blessed with willpower, others not so much.
However, once you get into a rut (like being grossly verweight) people tend to lose motivation to do anything about it. It's worse for those who didn't have a lot in the first place.
His point is don't stress over anything complicated. Do that one thing to get your foot in the door and to realize an accomplishment: walk.
His point of walking isn't to lose weight, it's to have these incremental milestones that allow a person who is in a rut and low motivation to achieve SOMETHING to keep them going. And walking is as easy as it gets.
With an established pattern of walking everday, one feels a series of small victories and they start proving to themselves that losing weight is possible, which gradually leads to higher motivation.
This higher motivation leads to branching out to other beneficial incremental victories like increasing the speed or distance or drinking one less soda during the day or eventually changing to an active lifestyle and working out.
However, none of this would be possible if the small victory of just getting out and walking did not occur.
So to wrap it up, address your motivation. Once you aquire more motivation, it will lead you to tackle even more regarding your path to weightloss.
But the way he wrote the OP, leads people to believe he is address weight loss, which indirectly he is, but in reality he isn't.