The Guardian "our deportation laws are systemically racist". Who writes this stuff - of course they are the obviously only target non-nationals.
They are quoting the director of Detention Action. And yes, our deportation laws target non-nationals but the system is clearly systemically racist, disproportionately targeting certain ethnicities. For clarity, the proportion of black children deported is much higher than the proportion of black children in the immigrant community.
he seems to be a potential threat to law order and not much of a benefit to the country
Did you actually read the article? He was convicted under joint enterprise. In other words, he did not commit a crime. He was present when a crime was committed. Given that our justice system is systemically racist and "joint enterprise" is almost exclusively used to target young black men, he would almost certainly not have been convicted of anything if he were white and not autistic. I doubt he is any more of a threat to law and order than the average young male.