the issue isn't the immediate process though, @RainbowRoadshow is correct in how that all works and explains it far more eloquently than I ever could, the main problem is after that moment - many countries do no share data with the UK, so we have no way of knowing if those applicants have criminal records/has asylum granted elsewhere/are wanted for any crimes. At the moment the UK takes over 18 months from making the claim to asylum being granted, this allows 18 months for those who want to, to disappear under the radar - and when over 2,000 people a week are arriving it's not hard to see how the majority aren't always genuine.
There is the case of the Albanian man who arrived as an unaccompanied child under a false name, later committed a crime here but fought deportation under human rights grounds because of his sons sensory issues, made huge headlines because one of the arguments was his sons needs meant he could only eat chicken nuggets available here, so Daddy can commit crimes under no threat of recourse because human rights say his son and mum need him here with them to help with his sensory needs.
There was a celebratory post a few days ago on X from someone in gov't regarding how no boats had arrived in 2/3 days (i cant remember it exactly) as if it was a government success - the actual reason was the weather the waves were too high and wind too much and so they didn't travel.
Its not at all surprising how many of us have lost faith in the system anymore, when more people than are in my towns population can arrive in the country and disappear in the space of a single month, and it's happening every month, year on year with no let up.