What impact do you think not clapping for the NHS would have?
In terms of ending the coronavirus epidemic? None at all. Silly question.
In terms of encouraging those brave men and women (not just in the NHS, but those caring for those the NHS doesn't deal with - on half the pay and without any PPE too) who risk their lives getting in and around and caring for people with this horrible lethal virus - it means everything.
Perhaps you're the sort of person who would have watched the young pilots flying our to take part in the Battle of Britain and responded, "Nah, they're just stroppy kids having the time of their lives playing in aeroplanes". No, probably you're not - but why come across as a pr*t with that sort of post?