I think the logic that taxing ice cream (and then all other sugary things) will follow as a result…

Also, ice cream likely contributes to satiety, while soda likely does not (study results and quality vary here, but I’m convinced for now). That is, you should feel like you consumed 150 calories after eating 150 calories of ice cream, but you should still be hungry after consuming 150 calories of soda (or at least, your body may not think you consumed any calories even after you consume 150 calories of soda). Therefore, we shouldn’t have to use price to convince you not to over-consume calories from ice cream. We may (and I think we do) need to convince you not to over-consume soda by way of price, since your own satiety may not (and I think won’t) cut it.