Putting aside the fact that many of your posts simply refer to immigration rather than either uncontrolled or mass immigration, I can’t put it any better than Mothman did:
‘As a country we have gained far, far more from immigration than we have lost. Advantages would be from the everyday (being able to buy a pint of milk on a Sunday, pre-Sunday opening, a decent range of food we would never have experienced otherwise) to the esoteric (appreciation of a different culture or point of view that enhances an individuals understanding). Disadvantages would be added pressure on key services and providing a situation which a certain sector of society can use to promote their own juvenile ideals. Many, many more on both sides of the argument, but this isn't really about totalling up scores is it - sometimes the sum of the parts is greater than the whole.
Mass immigration has little, if anything, to do with your perception that we can't speak our minds - this is the result of home-bred do-gooders who feel morally superior when they can be offended on behalf of someone else. Thankfully there's still no law that states that anyone has the right not to be offended, but don't let that get in the way of a Daily Mail headline or your willingness to be offended at not being able to offend.
Likewise the words you chose to quote, whilst these can be (and are) overused and the refuge of the professionally offended, they also have a place when used in the correct context. If you're saying that there were no racists, bigots etc prior to immigration I'll call you out - if you're saying it was OK to be one of these before immigration and the worlds a worse place for not being able to promote these views now, I'll call you a fool.
Could the UK exist without immigration? Of course, but good luck getting the shell-suited, WKD drinking, dole claiming, self-entitled window lickers off their sofas to empty your bins.
I wonder if this same conversation is happening on the Spanish version of Answerbank, with someone asking "Has The Influx Of British Pensioners And Criminals On The Scale That We Have Seen It, Been Beneficial To Spain? And Do I Really Need To Capitalise Every Word In The Title?" This is not just a UK problem and it's not a recent one either, sometimes I wonder if we shouldn't just be grateful that we were born in a country that so many other people aspire to live in?
And no - I'm not a bleeding heart leftie (far from it), just not driven by desperate Daily Mail / Express headlines. ‘