He is a gambler who has taken a punt with the health of the citizens of this country. It's personally backfired.
No he hasn't, some people have little understanding of this world wide pandemic and how in the back scenes are scientists and experts scrambling for solutions.
You are so bitter in your partisan echo chamber that you highlight how really uneducated the electorate really is.
He ignored the advice that the experts gave him to give out (shaking hands, lack of social distancing). And yes, he is a political gambler. Check out brexit, the prorogation of parliament and the election. Some gambles he has won and some he hasn't.
Herd immunity is a huge gamble. HUGE. Because they don't know enough about this virus to predict the outcomes. Therefore a gamble. And the way the government has handled matters is not great. He personally is now suffering the consequences.
By the way the government initiatially relied on mathematically modellers and behavioural scienctists more than the biologists as the experts. Expert advice is always viewed through a political prism in its implementation.
Some of electorate don't look deeply and prefer to use soundbites....