I can. Because in order to have any hope of being effective the tax would have to be truly enormous, at which point it becomes just a cash grab with potential unintended consequences and still may not achieve its intended purpose.
I think a better answer is public education, and since governments are always more anxious to find new ways to take money in than to spend it on things like public information programs, this is what we should be pushing for instead of encouraging the easy route to more taxation. I know this is the typical conservative anti-government attitude, but in this case for once I agree with it. The tax approach was tried with liquor, and we still have alcoholics and alcoholism. The only thing it’s done is made decent wine even more outrageously expensive and given the government an ongoing tax windfall.
What people need to understand is that sugar is unhealthy in ways that go far beyond its mere calorie content. It contributes to non-alcoholic fatty liver disease, insulin resistance, heart disease, and promotes fat out of proportion to its already high calorie count. This is one piece of information that forever changed my attitude to soft drinks, the other piece is just how much sugar there is in a typical soft drink – it’s basically water saturated with sugar, with some flavor and carbonation added.
So, while it’s probably wise to avoid soft drinks altogether, I still enjoy something like Coke Zero once in a while, but I wouldn’t touch the regular stuff. If more people had this perspective, they’d likely do the same. Mission accomplished, and no tax required.