A lot of people stopped work when they shouldn’t have. Factories and offices shut down, when they should not have done so. If people could work from home then they should have, everyone else at work, other than those businesses on the shut down list. For example shops, showrooms etc.
Because so many shut down and then claimed the bill is billions more than expected. There is no magic money tree or endless pot of money, it’s taxes that are being spent to pay for it. They are borrowing heavily to fund it.
The financial impact is so much bigger than expected because companies and people just stopped when they were not supposed to. They thought it was just key workers to work.
So they need to get everyone back to work. Companies will go bankrupt because they stopped trading during this period, and will likely continue to stop trading untill lock down is eased.
The government can’t pay for everyone who stopped to stop, and the welfare bill will be enormous if unemployment rises.
Right now there is a significant problem simply because people stopped working, companies shut down, when they were supposed to keep working.