The term "lockdown" gets bandied about without people thinking about what it really means. It means we stay in our houses, business and shops are closed, no social interaction. If we get back there, then its a massive failure of the reaction to this pandemic. We've got one of the most effective vaccines ever and we've had 18 months to prepare a tracing system. So if that's not good enough, we've failed. Restrictions might return - limited numbers at events and so on, but not lockdowns.
Your comment about people not being out and about if its not necessary, I just can't agree with growstuff. DH has just popped down to the shop to get some nice bread. Is that necessary? I went to see a local RHS garden earlier this week. Was that necessary? I think people are not prepared any more to put their lives completely on hold. I wouldn't go to a festival, that's my choice, but I went to the local Farmers Market at the weekend just for a look round and to meet my friend for coffee. Not strictly necessary, but I felt a lot better for it.