Regardless of anyone's views on x number of people coming in from the Ukraine, the law of averages says some of them won't be very nice. By that I don't necessary mean criminal, just not very nice. So there could be scenarios of some old wifey living in a large house doing the right thing and inviting a Ukrainian family to stay.
Fine, good for her.
Fast forward 5 years and, even though the old wifey might not be fully aware herself this has happened, the family through subtle manipulation and coercion are essentially living in said house as if it's theirs, with the old wifey practically consigned to living in her bedroom with en-suite.
Obviously this sort of scenario won't happen in many cases, but it will happen. If anyone thinks otherwise they're deluded.
And no, before you start greetin' at me, I don't think it's wrong to let people in. I'm just stating a fact. For example, if you go to a show in a theatre, let's say the auditorium holds 2000 people. Law of averages says there'll be at least one of almost all kinds sharing that space with you. Nice people, horrible people, criminals, wife beaters, husband beaters etc.