The reason Dinulescu doesn't go after the idiots directly is the same reason you go through insurance companies when there is damage - because that is the service you are paying them for.
Now, AirBnB can absolutely go after the guests, but they have to decide if it is worth it. It is going to cost resources and money (probably more than the $8000 they are paying), and there is still a good chance that the guests won't be able to pay them back anyway. It is probably not worth it.
That's a good point, but still shouldn't these people be held criminally liable? I feel like they went well above what any local law would allow for their behavior.
The police should really go out of their way to make examples out of the partiers. Charge them for every single act of vandalism, drug use, public intoxication, public urination, assault, battery, disturbing the peace, etc., and seek the maximum sentence for every one of them.
And for the official guests who actually rented the room and threw the party, charge them under organized crime and racketeering laws. After all, they organized a group of people to come to a rental property and commit numerous crimes. The police's explicit goal should be to Swartz them.
Now, AirBnB can absolutely go after the guests, but they have to decide if it is worth it. It is going to cost resources and money (probably more than the $8000 they are paying), and there is still a good chance that the guests won't be able to pay them back anyway. It is probably not worth it.