Nobody is saying that he committed the crime because he was an immigrant namechange so you're making pointless statements arguing against something which nobody has said.
But does the current system of dealing with migrants (and particularly asylum seekers) in mainland Europe facilitate this sort of thing? You bet it does.
This man will have been able to move from Greece and Germany with no questions asked. When he arrived in Germany he would have been able to give a new name and new date of birth unconnected to his offending which would have been accepted with no questions asked because he was an asylum seeker. And that system is definitely providing opportunities for offenders to go under the radar.
We don't have violence against women sorted. But we do try. For example if men have committed serious violent offences and are released from prison there are at least attempts to supervise them and minimise the chances of them reoffending and I assume Germany do too. But that's all pissing in the wind if you've created a class of hundreds of thousands of men who can just change their name and turn up somewhere else with no papers and just pull a new identity out of the air and leave that offending behind. It was the same with the Cologne attacks where the police admitted the attackers were very unlikely to be caught because their identities were completely off the radar and could be changed so there was no hope of tracking them down. Ditto several of the offenders in the French terror attacks over recent years who investigation has shown popped up in various places all over Europe over the years with different names and different ages.
And this 'Oh well we have got violence against women' stuff is drivel. That doesn't mean we should give up trying to stop it. We have a two tier system now. Domestic attackers can't just up sticks and turn up somewhere else and get housing and financial support with a false identity. Attackers who are asylum seekers can. This is a loophole that needs closing.
Perhaps namechange, you would like to meet some of the victims of these crimes and tell them that they don't really matter because if someone gets raped by a German bloke they might as well be raped by an Afghan too?