Someone who is a citizen of the UK who has no connection to Iran or Russia is legitimately much more concerned with the ways in which Starmer governs the UK, than in whether Putin or Khamenei "win". I don't even disagree with you that Putin and Khamenei are ruthless dictators, and certainly plenty of people in Russia or Iran or countries in the Russian or Iranians sphere of influence have plenty of good reasons to politically oppose both those dictators. But a democratically-elected official can wield the power of the state against you and harm your interests just as much as a dictator can, and people in the UK who oppose Starmer and his party shouldn't let up in that opposition just because it makes Starmer seem closer to Putin or Khamenei than Starmer's supporters would like.