There's a lot of misinformation around the Sudanese issue.
It's important to keep this separate from the potential Sudanese crime issue. This was terror related with the man apparently doing it due to his dislike of the treatment of Muslims and some mental health related issues.
That said, the stats have Sudanese carrying out 1% of the crimes in Victoria which is a very low number, but 10% of the Sudanese population in Victoria has been engaged in criminal activity. That's a very high percentage compared to other nationalities but it's also only 10% so best for people not to vilify a whole community. It's also not a massive amount of people. 879 people in a state of over 378,000 people