Why would you not be concerned about a large migrant influx when we dont have the housing, service's or infrastructure?
Because the alternative is worse, namely the complete collapse of the care industry and NHS.
We cannot welcome people then give thm a tent to live in because we dont have enough home for them nor can we welcome them and not be able to provide medical care, support or anything else they may need. I think long term anyone who comes to this country to live should be contributing positively towards its economy and integrating (and many do)
Just as well then that the research proves migrants are net contributors to the economy, moreso than the indigenous population on a per head basis. If you want to solve the financial aspect of the housing shortage and declining care standards, you should be clamouring for more migrants, not fewer.
The numbers arriving suggest lots of boats are not getting turned around
Yes, because any boat that makes it to UK waters either makes it ashore, or is intercepted by the RN, Coast Guard, UK Border Force and escorted to a UK port in accordance with international law. There is no basis whatsoever for the UK "turning around" boats intercepted in UK waters because not only would that be in contravention of international law, it's impossible to say from precisely where the boats originated and therefore where they should be "turned around" to, the UK can not carry out the duties of other states vessels in other states territorial waters, and "turning around" boats would constitute an unconscionable risk to the wellbeing of those onboard.
So again, what precisely do you want done with small boats given the strictures of international and maritime law?