Well, in theory, if they're in the country through legal routes then they will have had to provide financial assurance throughout the visa and/or ILR application processes.No. I'm not going to get involved in fruitless arguments about who's a good immigrant and who's a bad one.
The only exemption to this would be approved asylum seekers.
If they're a net drain on the country then they're obviously a bad immigrant and not in the country's best interest.
I think immigration is absolutely necessary, but on sensible terms and properly managed and policed.