Of course there is a need to deter. That’s not in question. The question is what is the most effective way to do it?
That’s why we ask experts to make studies, produce recommendations and issue guidelines.
Perhaps though we should save the country a load of money and just make policy after reading the comments here.
We would sink all the small boats full of migrants, send everyone not born here, or having a relative not born here, or holding unacceptable beliefs, with a one way ticket to somewhere unpleasant. We would lock “nonces” up and throw away the key. Immediately stop foreign aid and all support for Ukraine. Ban all protests unless approved by the members here. Etc.