Theresa May introduced the Hostile Environment, and Priti Patel made it even more strict. If the Home Office could refuse asylum applications for any reason whatsoever, they would. Despite that, the vast majority of asylum applications are successful.
So they are not cheating the system and they do have the right to be here.
Besides which, how many people do you think we're talking about? Small boats. The clue is in the name. It's not like Dunkirk out there.
You're quoting the statistic about how many people were stopped on landing or shortly afterwards to tell me how they're arriving "unchecked".