As we see in the instances of so-called "revenge porn", you don't have to be famous to be the victim of these tactics. It just takes one person who becomes annoyed enough to use some of these tools and then you're left with an expensive and time consuming mess.
Did you have a nasty break-up? Fire someone? Do you have a business rival who would like to see your reputation ruined? Did you leave a comment on a website that just happened to offend the wrong person [1]? The tools to completely ruin your life are becoming easier and cheaper to wield, and the costs of defending against them are only increasing.
Even if the likelihood isn't high, the consequences are severe enough that you should take the risk seriously. Objectively, the likelihood of you getting robbed isn't that high either, but you lock your doors and don't leave valuables sitting out in your car either.
[1]: https://gizmodo.com/when-a-stranger-decides-to-destroy-your-...
EDIT: note that in the link above, the attacker wasn't even using non-public data. Imagine how much more damage someone with the ability to gain access to bank accounts, etc. could have done.
