Merchants provide a value to society and pirates harm that. The thieves are providing a value to society in this case by damaging casinos, which provide no value to society and only harm citizens.
> I encourage you to walk through some casinos and take stock of what you see.
I have spent a lot of time at casinos with family members who love eating, drinking, smoking, and gambling. Know what I've seen? I've seen that gambling is the only one of the four that hasn't killed at least one of my family members.