Thing is, they're not even that thick, at least some of them aren't. They're just so blinded with hatred for the Labour party and Corbynista politics (some still conflate the man with the party; as if socialism would ever take off in a global, western economy) that they can't summon the integrity to vote for change. They're obdurate to the point of self-destruction. It's as if the country hasn't been ravaged and picked to it's bare carcass in the last decade.
The Tory party have large portions of the electorate eating out of their hands for two reasons.
1.) We are a country of xenophobes and closeted racists. Truth hurts. The vast majority aren't, I will qualify. But there's a definite undercurrent; and the ultra-nationalist drum that the Tories have been banging ever since the Brexit referendum played on these sentiments. The Tories were the biggest advocates for divorcing from the EU, and the nationalist lemmings in this country lapped it up. All of a sudden, Johnson and his vanguard of Cronyism were the countries saviours. Even in staunch red seats, the tide turned because too many believe immigration to be the great scourge of this nation, and now the Tories were promising to restrict Jozef from Poland coming here to work every hour that God sends, picking fruit or delivering takeaways to the greedy cunts who sit on their arse and bemoan their belonging in this country in the first place.
2.) Division has never been starker. We live in the information age. The digital age. The phenomena of gratuitous information and minute-by-minute news has exploded exponentially since the Tories came to power. This digital age has led to firmly entrenched ideals and values. Once you've nailed your colours to the mast, that's you. The wriggle room for open-mindedness is zero. The Tories have large swathes of the electorate doing their job for them online. The ministers take their gross mistruths, dress it up in florid Oxbridge rhetoric, dump it into the digital space, and the lemmings disseminate the narrative until it's accepted as truth.
It's a sorry fucking state of affairs, really.