Should we subsidize bad decisions?

As per this article in WSJ
two-thirds of Americans are now overweight and one-third are obese. Most of the diseases that kill us and account for about 70% of all health-care spending—heart disease, cancer, stroke, diabetes and obesity—are mostly preventable through proper diet, exercise, not smoking, minimal alcohol consumption and other healthy lifestyle choices.

So, if most of the health care cost is due preventable issues, should I pay for bad decisions of others? If we get govt. health care, it looks like that is what we will have to do.