I agree on the 4th point that the causes of obesity are way more complex than just eating. we need more medical information for that
I feel that the 1st point might be partially true as for some people, they need a motivation to get rid of something or start anything new, So it depends on the person even then we can't blame them completely.
I don't agree on both 2nd and 3rd points as we can't judge anyone based on looks or physique. People might have some serious ailments due to which they gained weight. Also there are people healthy and fit yet is obese.
Body shaming is not acceptable and we do not get the right to judge anyone like that.
We need to remember that it's 2020. We are getting educated enough to understand that.