Their policy is to shift blame on to the population. One look at Twitter and it's working. Most used phrase must be 'selfish b*stards'.
Policy isn't about doing what's best, it's about what absolves blame. They want the conclusion of the whole thing to be that they tried to do the right thing, but people didn't follow the guidelines and so they are to blame.
I'm the first to criticise, but I think one massive thing to learn from this is that (and maybe I'm giving them too much credit here), if there was genuinely a huge threat to the population, the government might strategise their moves based on what the population needs. I think privately their stance is still to continue as normal as there's little threat, but they know that won't wash at this point.
Everything they do now is with public perception firmly in mind. If that means locking down because demand dictates, so be it. So be it, even if it causes more long term harm.