First off he was democratically elected by 42.4% of the voters. No problem with that; it’s how our system works but it’s not a majority. There’s no suggestion he’s inherited anything, he’s bullshitted his way to the top job aided and abetted by an appallingly weak opposition with an even more unelectable leader.
Secondly, the 42.4% who voted Tory were voting for a buffoon and a liar to be PM, so it’s absolutely no surprise that when a real crisis happens that needs proper leadership and judgment, what we get is a complete fuck up.