It's far easier to eat unhealthy and do low levels of exercise than it is to maintain a good weight and stick with larger levels of activity. Environment is a larger problem than genetics imo, understanding that some people definitely have a much more difficult time in losing weight.
Like, if it was easy to eat healthy, this wouldn't be as much of a problem as it is. Eating a snack at a movie is going to crush half of your caloric budget. That's not okay -- it's not a meal, it's a snack. When I started counting calories and seeing what I was eating, I lost like 70 lbs in 6 months or so. And I feel a lot better, and I think a lot of people are capable of achieving an image that they want rather than coming up with ways to justify their body, but the societies that push the garbage foods we eat don't make that easy.