I don't think many people apart from the current Labour Party have a problem with deporting people who've committed serious crimes and have come to this country over the age of 18.
It's a bit more difficult morally when they've come to the country under the age of 18 though. Personally, I think it depends on the severity of the crime but given that all the offenders had apparently served at least 12 months in prison, I'm guessing it's not because they've dodged the TV licence.
We're one of the most liberal countries in the world when it comes to sentencing so I'm a bit sceptical when it comes to people complaining about how hard it is on serious offenders if they've had to do 18 months in prison then are deported to another country as free persons when in most other countries in the world (especially in relation to drugs offences), they'd be doing prison sentences 10 times longer for the same crime.