Well I would start with all those bonkers ones that have stopped convicted criminals from being deported and then move onto the ones illegal migrants use to stay in the UK or remain in the UK, if they have over-stayed their visa. There was an infamous case from when Theresa May was home secretary often brought up erroneously about a Bolivian man who overstayed and she said he had claimed to stay on human rights grounds because he owned a cat. The cat wasn't the issue, he was allowed to stay because he was in a long-term relationship and used the 'the right to family life' element of the Human Rights convention to be allowed to stay. In my opinion knowing he was here short-term he should have a) not got himself into such a meaningful relationship or b) made sure if he had done so that the woman concerned would be prepared to move back to Bolivia once his visa was up.
There was a thing in the news recently about a convicted member of a grooming gang - it took seven years to deport him to Pakistan and he was hiding behind the family life element of human rights to prolong and prolong things. Two things stood out: it cost 5.5 million of public money to resolve the issue through the courts (greedy lawyers defending the indefencible) but I also couldn't believe it when I read he was sent to jail for six years, yet allowed out after two and a half. Why not just deport him in the first place saving 5.5 million plus whatever 30 months in jail costs the country and use the money to help more deserving people which is basically pretty much anyone, because what he was convicted for was abhorrent. We are just such a very soft country though.
I also have a bit of a problem with people stating that they have to stay in Britain because if they return to where they have left, they will be persecuted for being gay or for being a certain religion (just two examples). Just because our country is progressive and inclusive doesn't mean everyone should be able to come here. Why not make changes in the country you live in - as we are seeing with the brave women (and their supporters) in Iran, right now. In Britain, in the early 1960s did all gay men secretly try to move to a more enlightened place and live their lives openly there? or did they work and work and work on getting the laws changed here, successfully in the end.
I sort of get what you are saying. You mention North Korea... but what about Australia? They wanted to sort out their illegal migration issue and they did their equivalent of a Rwanda scheme using the island of Nauru. I saw a programme about it, it was an absolute disgrace what those people went through and many suicides resulted. I can't make a direct comparison with people flown by us to Rwanda, because none have gone. But I doubt it will be Nauru 2.0 and yet is Australia considered 'a pariah state that barely trades with anyone'? I don't believe so.
In many peoples' eyes Australia is considered a strong country that took decisive action to sort out an issue of concern, whilst we are weak and do not.