Because we are members of society and we don’t just have to consider ourselves but others.
this is the primary difference between the pro and anti restrictions people one group think about how the rules restrict their lives and one group think primarily about how their behaviour affects others in society
I know which group I prefer being a member off
That's lovely but doesn't do much for the young student who chucked himself under a train up the road from me during lockdown one, citing in his suicide note that he couldn't cope with the isolation in his student residence anymore.
Or my colleague who died of cancer last year and spent her last 2 months panicking about leaving the house and not being able to acquire toilet rolls for herself and her young daughter, rather than having some final experiences and saying goodbye to those she loved (that was repeated several times over just amongst my acquaintances).
No warm fuzzy feelings about enjoying things another time and looking after others for now for them.
Get your vaccines, wear a mask if you wish and get on with your life. If you have a heart attack tomorrow putting things off for the greater good will be of absolutely no consolation.