Note to devious mouthpieces of Big Food ("Always with the negative waves, man."):
Something needn't the sole cause of a problem to be a cause of a problem. So when you fault any attempt to curb consumption of sugary sodas because soda isn't the sole cause of obesity, you're just obscuring the truth.
No, sugary soda is not solely responsible. The problem and its contributors are varied, confusing, and sometimes conflicting.