Not everyone’s job involves staring at a laptop screen. Somebody in a food canning factory can’t work from home. A pharmacist can’t work from home. A delivery driver can’t work from home.
Complete lockdown will lead to social unrest. Look at all the looting back in 2012 when GMP stupidly said they had sent some police down to London to react with rioting and looting after the Duggan shooting - a lot of Manchester’s shops were ransacked. There are always people who are going to take advantage because ultimately everyone puts themselves first when there is shortage or opportunity.