//...there are many shades of grey according to the real life situations in which people find themselves.//
Then explain one or two to me then, because the example you gave does nothing of the sort.
Here's my take:
I accept that it must be lived with. I am now leading a near enough normal life and have done so (as far as I was permitted) since I had my second jab. My neighbour is of similar mind, though she's a little more circumspect in where she goes. But she accepts that life with restrictions cannot go on. By contrast my sister-in-law has become a recluse. She goes out once a week on an essential shopping trip, during which she wears latex gloves. She "quarantines" her shopping for three days after purchase. She will not go out anywhere else. She will allow nobody into her house. When I asked her when her behaviour would change she said "probably never". She does not accept it must be lived with, only that it must be avoided at all costs.
Yes, there are grades of severity in each approach. But people now need to decide which approach they are going to take. All Mr Javid did was to suggest that people should learn to live with it if, for no other reason, it's here to stay. He did not insult bereaved families, he was commenting on he future, not the past. He had no need to delete his Tweet (in fact he had no need to post it in the first place, but that's another discussion).