Having read more of the thread, I really do think OP is getting unfair judgement.
Pps implying that the OP 'can't say no' or can't control themselves! I get what they're saying: it's not that you can't say no, it's resenting being put in the position where you HAVE to all the time. As some have said, colleagues can be really pushy and not take no for an answer - or there's emotional blackmail 'Oh, go on - don't be a party pooper on my birthday etc!' I've had all of this, and then constant digs about what I do or don't eat just because I refused a sugary offering.
I'm not overweight - but that's because I try hard to resist temptation. I don't buy this stuff myself because I know I'd eat it if I did, so like OP, I feel resentful when it's placed in my eyeline every time I want a cup of coffee. I know that's no justification for stopping others, as I've said upthread, but I think there could easily be a compromise so that only those who want to indulge see the stuff which is in a particular location.
It's OK being prim and saying that individuals are totally responsible for their weight and health. Yes, they are responsible, but the modern consumerist world places temptation in our way as never before in history. Manufacturers (whatever hypocrisy they spout about supporting healthy choices) push sugar at us and they know very well it's addictive - like flavour-enhancers (msg) in crisps etc).
Read Bee Wilson (academic specialising in the history of food at Cambridge) on this subject. Until 150 years ago there weren't really 'shops' as we know them. People ate a limited diet of bread, veg they had to grow themselves, a bit of cheese, beans and possibly a bit of meat and fish. The absolute crap which takes up so much of our supermarket shelves just didn't exist, and work was so much more physical that few people had the opportunity to become obese. As Wilson points out, a trip to the shop to buy a loaf of bread and a pint of milk often means walking past shelves of sugary, salty and fatty rubbish being pushed at us at very low prices.
II have no personal axe to grind here - I'm a healthy weight! Of course what we lift to our mouths is our responsibility, but please, those who think it's a black and white situation, acknowledge that we are confronted nowadays with extreme temptation of a kind unknown in human history.