1. Most immigrants are of working age, sure. But how many of them are actually working in meaningful jobs and contributing to the tax system? How many illegal migrants are being housed in hotels and how many of them are working? I don't think you realize the amount of them who just get paid by cash so actually none of them are truly contributing to this country's economy.
2. Young people and pensioners may very well be using up a lot of the expenses but they are perfectly entitled because those old people you speak of are the ones who have worked 40-50 years and paid into the system. The young population also the same as their parents have contributed to the system. Why should a newcomer with children have the same rights as a family who has contributed to the tax system their entire lives?
3. Newcomers are having children and many of those children are requiring healthcare, education, housing etc. The net migration of the UK has been 800k for the past few years. Do you think the UK has the infrastructure to support extra 500-800k surplus people every year?
5. Go check the employment records of the immigrant population and their net contribution to the economy and then come back to me.
I'm not really sure why I bother, but 76% of non-UK nationals have jobs -
https://migrationobservatory.ox.ac....migrants-in-the-uk-labour-market-an-overview/. Btw, a second analysis by Oxford put the net contribution of migrants of ~ £300,000 over their lifetime -
https://migrationobservatory.ox.ac....s/the-fiscal-impact-of-immigration-in-the-uk/
Regarding the "value" of those jobs, it's sadly all too common for migrants to work at levels below that they worked in their homeland -
https://ukandeu.ac.uk/migrants-skil...in-britain-and-hong-kongers-are-no-exception/. This is for various reasons, including language and contacts, but by far the most common is that their credentials aren't recognised. If we did better at that, we'd be able to tap into their skills more effectively, but this is historically a problem across the world. Again, it's one of those things the government "could" do more on. Maybe you'd be open to asking them why they haven't?
Regarding asylum seekers. I'm sure you know that they're forbidden from working for the duration of their asylum claim, which can be a very long time. Again, this is a criminal waste. Coming to the UK costs people an awful lot of money. It's often the middle classes (and up) who make the journey. They don't risk their lives for a better lifestyle. They risk their lives because their lives are in danger at home. I work with a number of refugee charities. Maybe do the same. Get to know some of these people so you're not reduced to caricatures of them that you get from Farage.
Regarding our "carrying capacity." From the end of the war to the Thatcher era, the population of London shrank by around 2 million people. Do you think there were similar fears then? It's now back to war levels, but inner London is still significantly lower than it was then. As I've said, regions deserve support from the government to cope with changing populations (whether up or down). Banning migration isn't the answer to Great Yarmouth or Scarborough.