there's a market for cheap, plentiful labour for jobs that should be done by our own indigenous people and for mysterious reasons, aren't.
The mysterious reasons are:
You get treated like sh!t
Expected to work whatever hours are asked, and never argue about anything.
25% of immigrant workers in the UK have been involved in or witnessed a serious industrial accident (Home Office's own estimate). The company delivers the required safety training, but it doesn't care whether that training is well-delivered, or relevant, or check whether you understood it or the foreman applies it. It's just a box-tick. That's also from the Home Office report, and matches my personal experience.
For which you are not paid enough to live a normal life. So you shack up 9 to a house (breaking any number of laws) and live out of tins from Lidl.
Now, this does not apply to all jobs by any stretch, but it doesn't take many before a fair few reasonable people give up and jump on the benefits wagon.
There are, of course, some really lazy b@stards already on that wagon.