The UK considered this approach but as cases piled up they reversed course. But as the Dutch believe in euthanasia anyway, it may be more acceptable for them.
Numbers of sick overwhelm the healthcare system when using this control method. What the US government is doing is seeking to control the spread so that the healthcare system can handle the extreme cases. New treatments will be developed and in time a vaccine will be rolled out. Like the President said we are fighting a war. Tactics will vary.
The Brits reversed course because the NHS sucks.