I disagree for several reasons.
Mainly because any attempt to reduce access to things via tax affects poorer people more, its just not fair.
Plus, it is ineffective, just look at alcohol and tobacco. My mum was a smoker for sixty years. It was her biggest weekly expense in the end. She eventually gave up reluctantly when she broke her hip and physically couldn't get outside to smoke for several weeks. Yes, she could have tried harder etc, but she enjoyed smoking and was very addicted.
My child suffers with severe ADHD and sweeteners upset his stomach, which makes his ability to regulate significantly worse than consuming sugar. We don't buy pop, juice or cordial, but it is not easy to avoid at social occasions, as things with sweetener are much more widely available.
Sweeteners upset my stomach. I primarily drink unsweetened tea, but again the move to some places selling only no added sugar or diet drinks, social occasions can now leave me without a good option, especially if im driving and would benefit from a bit of caffiene.
People with diabetes need sugar at times.
It's actually relatively easy to avoid obviously sweet stuff, such as sweets and pop, but it is harder when it is hidden in savoury foods eg pizza, tomatoey foods etc. I don't want sweeteners in my food.