Never play the hero. Cemetery are full enough of heros.
There was simply nothing to gain out of his situation. Calling the police would have been better. But I respect his audacity.
Migrants without being filtered lead to a huge rise of crime, that is a fact.
You have 3 problems with illegal migrants, one they are not logged in any of your national databases, which means that their fingerprints, DNA, and all biometrics are unknown, they are ghosts, in the case of a criminal or terrorist case, that could be a problem. Some migrants are wanted criminals or terrorists who are wanted by the authorities of their country, and you have absolutely no way to prove the opposite. Migrants are a security risk, first, before anything they could be.
The second problem with migrants, is that they are welcomed by national and regional corporations, to use them to lower their prices, the migrants end up taking & stealing the jobs of the national citizens. There is always a migrant, for who, the worst day of your life in the west is better than the best day of his life in the third world, there is always a migrant willing to work twice more than you for twice less. Also migrants often end up exploited, and abused, especially if working illegally, mostly used as a cheap workforce.
The third problem with migrants, is that there often in their handling, no filter, for example, an european country, accepted 100 bums migrants, junky migrants, uneducated migrants, and turned down assylum to a doctor who spoke 4 languages. At least make quota of migrants given residency or assylum, and if you were to take 10 migrants, take at least 10 doctors, 10 engineers, that would be a better endeavor than taking ten bums.
The right is too blind to solve anything, having ties to white supremacist, nazism, and racist ideologies. To see all migrants as evil is a mistake, since there are good migrants who can bring value and positive externalities, and there are bad migrants, who are rapists and criminals leading to chaos and trouble. For example, in a group of 10 migrants, one of them is a racist, let's say he raped 6 women, all the 6 women will declare that they were raped by a migrant, when in reality, there was only one rapist, since he is a serial rapist.
Migrants, and the chaos they create, like this case, are used by the media to create an ambience of fear, and to distract people from real issues.
Without a clear fair system, to handle migrants, with a solid efficient law enforcement, and for extreme case, the military, you will never be able to handle migrants, and your population will suffer with them as well. There are a lot that can be gained and obtained out of migrants, legal or illegal, and the right who believes in autarky and national independance, will never be able to see it.