Swallowed Because they want to. Does it matter?
IMO it does matter. I'd rather it didn't and we could have a whole world without borders and everyone being lovely to each other but unfortunately it's not like that. And it's never likely to be because those in power/with money don't want to address the real issues, which is that they have all the power/money!
I don't want to welcome rich tossers who buy up property in London, forcing house prices up and locals out, for example. Or those who see the UK as an opportunity to make money whilst paying to local population a pittance to work for you. In fact generally, someone who comes here because they want to make money when they're already comfortably off is a bit dubious - are people who place making more money above everything else (friends, family, decent weather
) really the sort of people who make a nice society/community? I must stress I'm talking about people who already have a decent lifestyle, and am specifically responding to the question "Does it matter why they want to come here?" so rather removed from the OP.
Also, and this is really sad, at least some people have very unrealistic expectations of living/working in the UK. And when they realise, their families back home are still piling the pressure on. A bit like the old cliche of going to be a star in Hollywood and ending up waiting tables/worse.
I only started realising this when I spent time abroad, and working here with immigrant colleagues. In particular, one country I travelled in people seemed bemused that I wasn't completely loaded. Eg. it might start with a question of why I was staying in and lead to a long discussion about the fact that I'd been waiting tables at home, slowly saved up (no car or motorbike - shock! Living in a rented room not a luxury apartment - shock!) and in order to have time to see lots of the country I had to stretch out the money. Also the difference between living costs... explaining UK prices in local currency (eg. for a can of coke). (And yes I know I'm still in a massively priveledged position but not to the extent imagined.)
And there were people I worked with back home who had left their children behind, to work as nurses in the UK, with the plan of bringing their family here later... but they expressed shock at UK prices and the hours needed to work to pay for a flatshare... all the while the family back home have pinned so much on them, how could they return even if they wanted to? Weirdly, a Filipino nuse who'd been here years (older, children grown) was explainign to me in hushed tones the living conditions of these nurses - "They don't even have a drier! Really, I've been to the flat and the clothes are hanging up inside to dry!"
She seemed surprised to learn I did not have a dryer, my own flat, etc. (I was on a lower wage as a carer) - as if by virtue of being British I was somehow magically loaded.
So yes the reasons someone is coming here do matter, to prevent bad decisions all round. Unfortunately most discussions/plans to reduce immigration seem to revolve around letting the more well off and professionals in (and no plans to actualy train out own for those jobs...) taking what we want from those countries and leaving those in genuine need.