> It's usually considered a good thing to campaign for changes in politics
Not true in many contexts, and comes across as preachy and holier-than-thou, especially when using guilt. Campaigning upwards is fine, even for diet, but not downwards.
I hear this complaint a lot about "imposing" beliefs, but mainly when it comes to diet. Why does diet get singled out?
It's usually considered a good thing to campaign for changes in politics (e.g. for/against drug legalisation, for/against vote reform, for/against higher taxes). You may not agree with a particular argument, but I think most people agree that being allowed to persuade people towards a point of view is part of a healthy society.
Why does politics when it comes to diet get such a visceral reaction?