Currently the sugar listing on a label is very deceptive.
It includes the "added sugar", but also the natural sugar that is found in healthy foods like fruits and milk and yogurt.
I agree with you and hope that in the near future, labeling laws will change and the sugar listing will be just for added sugar.
Until then, I think you will find this USDA file helpful for it lists the actual added sugar in over 2000 foods. Yes, you will have to calculate this manually, but at least it is an accurate start. www.nal.usda.gov/fnic/foodcomp/Data/add_su
SP Registered Dietitian Becky