Why is there always one bad apple in the bunch to ruin the bushel?

https://www.huffpost.com/entry/nigel-farage-wins-clacton-race_n_6685431be4b0940ade429dfc
Trump Ally And Brexit Champion Nigel Farage Wins Seat In Blow To U. K. Conservatives

Nigel Farage, an ally of former President Donald Trump, won his race in Clacton, an English seaside town, in Thursday’s U. K. general election, becoming a member of parliament for the first time in his political career.

Farage, the leader of the right-wing populist Reform UK party, won 46.2% of the vote, defeating incumbent Conservative candidate Giles Watling who held the seat since 2017.

Farage, a key architect of Brexit, had previously failed to get elected to the House of Commons seven times. This year he appears to have succeeded in capitalizing on voter resentment toward the center-right Conservatives as Reform UK won at least four seats, including his.
“I think what Reform UK has achieved … is truly extraordinary,” Farage said after his victory. “Given that we had no money … virtually nothing across the country, we are going to come second in hundreds of constituencies. To have done this in a short space of time says something fundamental is happening.”

He went on to tell reporters later he believed Friday’s results were the “beginning of the end of the Conservative Party.”

Why is there always one bad apple in the bunch to ruin the bushel?
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