Who knows what Paulus was thinking or doing during all of this? Looks like Joran did quite a bit of roaming around the island during the late night and early morning hours. That by itself isn't a crime...but when you are the last person seen with someone who is now missing, all of these factors get brought into the mix.
Three possibles for Paulus:
1. He's totally clueless during all this and is now trying to protect his son.
2. He is a parent by default and doesn't really expect much of his kids nor does he think he needs to spend much time with them.
3. Like father, like son.
Is there a curfew on Aruba? (guess I should know this by now, but I don't remember)