I’m Jewish. My own grandparents came to this country from Czechoslovakia and Austria; just two of a handful of my mother’s family not to end up in Bergen Belsen or Auschwitz. They came here as frightened young people who knew nothing of the country they were joining or the fate of the family they left behind.

Until now I have always believed that the Labour Party is the best defence against the type of hatred that we saw in 1930s Nazi Germany, and the bigotry now growing again in other parts of the world. The Labour Party exists to represent the interests of the many, but that cannot mean silencing or disparaging the voices of the few, and the Jewish community are few. If the UK were made up of just 200 people, only one would be Jewish.

Solidarity with ethnic minority groups is not selective. Support for the Palestinian people is not an alternative to support for the Jewish community, but that is all too often how it is expressed. Let me say it now, sadly but clearly, the Labour Party currently feels like a hostile environment for all too many Jewish people like me. That is not just a stain on our movement but a tragedy for our country. Tolerance is not a spectrum, it’s binary, and right now we are on the wrong side of that divide.

As the Party begins its search for a prospective MP in Sheffield Hallam, for now, despite encouragement from local people, the growing intolerance of our movement has crushed my belief that I could play an active role in putting the Labour Party into government and Jeremy Corbyn in Number Ten. I hope I’m wrong. I hope we regain the courage to respect a diverse range of voices, not just the Jewish community, but all those people with whom we disagree, without challenging their right to speak out or the good faith in which they do so. I hope we can rediscover what we used to know; that tolerance and empathy not only make us stronger as a movement but are a fundamental requirement of a transformative, socialist Party of government.

British politics reminds me of a Land Rover stuck in a field: the wheels are spinning, mud is flying everywhere, but there seems to be no possibility of moving forward. Theresa May somehow manages to be both reckless and cautious – which is almost impressive until you remember that she can’t even get two dozen of her own party, sitting at the same cabinet table, to agree what the Brexit end-state should be. Instead, the Tory party indulges itself in therapeutic infighting and preparations for the next leadership race. It has learned absolutely nothing from the referendum campaign, which was seen through the psychodrama of Dave vs Boris, a rivalry dating back to their school days. (I suppose it’s part of a grand British tradition that the EU referendum was lost on the playing fields of Eton.)

Not that Labour is any more inspirational. Its tactic seems to be, to borrow a phrase from Johnson, to wait for “the ball to come loose from the back of the scrum”. In other words: hang on for a Corbyn government. But that isn’t good enough. There might be four years of this parliament left to run, and all the indications are that the economy will get worse, wages will stay stagnant, homelessness will continue to rise, prisons will remain dangerously overcrowded, the transport network will continue to crumble, the NHS will gasp desperately for more money and we still won’t build enough bloody houses. This is no time to tend to the allotment and wait for your turn to come.

With noble exceptions such as Anna Soubry, most Tory MPs are keeping quiet about the disaster they think is coming because they are afraid of their voters. The bulk of Labour’s parliamentary party is keeping quiet about still thinking Jeremy Corbyn is hopeless because they are afraid of their activists. Corbyn himself talks relentlessly about a “jobs-first Brexit” to disguise the fact he’s fine with pretty much any kind of Brexit. (He knows that, unlike him, the majority of Labour members, as well as Labour voters, are pro-European.) May pretends that Liam Fox is the best choice for the job of trade secretary, when the truth is that his globe-trotting pointlessness represents nothing more than appeasement. And if Rees-Mogg enters the next Tory leadership race as the favourite, how many of his colleagues in parliament will have the courage to say to the swooning Conservative grassroots: we’ve seen him up close and you’re making a big mistake?

I’ve been writing about politics for seven years now, and it’s double that since I first became politically active thanks to the disastrous Iraq War. In that time, I’ve never felt so depressed about my country and the quality of the people who want to lead it. Previous governments in my adult lifetime have been variously wrong, and cruel, and misguided, and deluded, and complacent. But I can’t remember a time when Britain’s problems seemed so large and the politicians confronting them felt so small.