I honestly don't see why, if someone is having a grocery delivery, that it matters if the order contains chocolate and gin amongst the lentils and turnips. It really makes no difference, and self-denial is entirely pointless in that circumstance. Leaving the house specifically to get chocolate or gin is a different matter entirely, though, as that could, potentially, put others at risk.
The government has taken the decision to have millions of letters delivered across the country. Is this in contravention of its own policies of 'flattening the curve' and reducing risk to the population, or are they taking the view that there is minimal risk in having them delivered?
The question of Amazon's ethics is in many ways separate from this discussion, IMO. We would need numerous threads to cover tax evasion, the exploitation of workers, the whole concept of zero hours contracts, the effectiveness of customer boycotts, and much more besides. There are those who already boycott Amazon, and they, I assume, will continue to do so during the crisis. Others don't, and won't be now.
I still feel that we should all concentrate on doing what we can to minimise the risks to ourselves and others, and let everyone else do the same. High blood pressure is a risk factor in this crisis, so it could be argued that getting one's knickers in a knot about what others are doing is putting strain on an already stretched NHS