I'd bet good money that this dude has some sort of antisocial personality disorder, and really can't be "cured", so to speak.

Something tells me he'll try to sneak out of Finland (which is easy due to Schengen), purchase a new passport, and leave Europe.

I guess a silver lining here is the possibility that he'll commit crimes in countries with far harsher penalties than Finland.

I've lived in Finland myself, and currently live in Norway. Lax punishments for the sake of rehabilitation is the standard, and I'm fine with that. But some people, like this one, simply can't be rehabilitated.