Countries (such as the UK) that are easing lockdowns without implementing track-and-trace procedures are actively encouraging people to catch the virus. Widespread testing and contact-tracing for anyone who exhibits symptoms is the only way to prevent a return to exponential growth of case numbers.
Why is the UK encouraging people to catch the virus? Because for the Conservative government, the people who will catch it are the poor, the expendable people. Those who can't work from home. Those who have to travel into a city centre and don't have private transport.
The aim is get the economy running again, with the added bonus of getting some expendable people infected and so boosting the herd immunity. Win-win for the rich. They couldn't care less if some poor people die. Here are some pictures of London transport yesterday:

https://www.bbc.co.uk/news/uk-52645366And there is a third point, too. The UK government were deliberately vague about getting people back to work. They told people to return and to use social distancing and "common sense"... even though any idiot knows that it is impossible to return to say London rush-hour with 2 metres between each person. There was no guidance really on the specifics, on how this would work in practice. Why? Because this is about blame. When the outbreak accelerates again, the government can point to these people crammed onto buses and trains and say it was their fault, they didn't follow guidelines, they didn't social-distance.
There's a very revealing interactive visualisation
here that clearly demonstrates the absurdities of rush-hour social-distancing on the London underground.
