In your admirably concise analysis of the government’s failings over the past week, there are two flaws: one of them delusional, the other an omission (The Guardian view on Boris Johnson’s government: an omnishambles week, 20 August). First the delusion: “Much depends on Conservatives with consciences” may have made sense until 12 months ago. Then MPs who dared to challenge the leadership on a range of topics, not just Brexit, but crucially the unlawful prorogation of parliament, were thrown out of their party. Others who shared those opinions decided not to seek re-election, and as a consequence the Conservative parliamentary party can now easily be passed off as a slightly more media-friendly version of Farage’s Brexit party. If any are left who have the conscience necessary to challenge “the New Tory party”, they will be fearful of showing themselves until such time as things are much worse and they have no alternative. The omission: aside from citing one opinion poll that suggests Labour is beginning to eat into the Tory lead, the opposition does not feature. I hope that MPs from all other parties are hatching plans to harry ministers at every turn, challenge every decision and use the full force of parliamentary procedure to expose the lies and to investigate the growing suspicion that public money is being misused to feather friends’ nests. Les Bright Exeter, Devon • Martin Kettle quite rightly sees Boris Johnson as a threat to parliamentary democracy (Johnson vowed to strengthen parliament. Yet he and Cummings are silencing it, 19 August). But we should not be surprised. “Johnson talked about how MPs didn’t count, they were just marriage-guidance counsellors on a Friday,” Tony Benn wrote about a radio discussion between the two in 1997. “I just went for him. I shouldn’t lose my temper, but actually it was quite good.” And good too if a few more people now lose their temper about what Kettle chillingly identifies as already almost amounting to “a quiet coup”. David Kynaston New Malden, London • What an amazing speech by Barack Obama to the Democratic national convention. Perhaps Theresa May could download it, replace the words Donald Trump with Boris Johnson, president with prime minister and America with the United Kingdom, and then deliver it in the Commons. If only parliament was sitting. Elizabeth Brett Welling, Kent • Join the conversation – email guardian.letters@theguardian.com • Read more Guardian letters – click here to visit gu.com/letters