Yes, I edited the comment as I decided that criminals is too narrow. It's really a simple evaluation of whether you extract more value than you produce - which is usually true with criminals but could be expanded to include any migrant who is receiving state benefits while not making efforts to contribute going forward. Now, obviously there are exceptions and caveats but I posit there's a larger group of non-criminal migrants who are still a net-drain on the society that's supporting them.