Perhaps those who object so strongly to the Border Force picking up these immigrants would volunteer for a new force to replace them? They would have to have some clear objectives, though.
1) They would need to know where to go to intercept them, and when.
2) They would need a plan for what to with them once intercepted. Would they -
. 2a) tell the owner/pilot of the boat to turn round and go back (they would then need to make sure that he did so, and didn't sneak back in somewhere else under cover of night.)
. 2b) drill a hole in the hull of the boat so that it sinks and let them drown.
. 2c) arrest the owner/pilot for people-trafficking and take him into custody. They would need to interview the passengers first, to make sure they were indeed being trafficked, and not willing customers.
. 2d) arrest all of them and take them into custody. Some would escape when it was obvious that their fellow-passengers were being arrested.
. 2e) put everyone into a people-carrier and take them off to be interviewed
3) If they adopted plan 2c, 2d,or 2e, and found out that the passengers had no passports, or false ones, they would face another dilemma - what to do now? Should they -
. 3a) Deport them back to where they came from. But where was that? Was it where the boat set out from? Was it their country of origin? With no passport, how to tell what country that is? What if they just pick some desirable place where they would like to live? Checking could take some time, and without a passport they would probably not be admitted anyway - but Hey Ho! the problem would be handed on to somewhere else. And how to deport them? - flights are few at the moment and not to be wasted on unnecessary journeys.
. 3b) Put them into a holding camp. Errr - that has been done before, in Calais among other places. It wasn't 100% successful, and with the virus it could be lethal. Do they really want to kill them all off? If so, option 2b would be quicker and more honest - but not the most ethical!
And so on!
It is more complicated than just declaring that they are unwelcome!