I'm a long time vet, I've been playing since launch, but I've never understood attacking and killing a freshly spawned vessel?

Today, I logged in with an hour or so to sail. The house was quiet, the wife and kids were gone. I thought "I'll enjoy the seas for a bit and see what adventure comes my way.

I stocked the ship, started to leave port, realized I forgot to raise an emissary flag. Two dudes in a sloop cannoned over, hopped on my ship, killed me a few times, firebombed my ship then acted like they were going to leave me be after I put out all the fires and repaired everything. I started sailing away only to realize they were still on the ship. They then loaded all my supplies into a supply box and threw it over the edge.

What is the appeal of this? Like I guess if you thrive on salt, then great, but it makes no sense, you gain absolutely nothing and all you've done is ruin someone's time spent in the game for the day.

I love PVP, I enjoy doing it, but to me this kind of behavior seems beyond pointless. When you kill someone at seas, you get loot, ect... I guess I don't see the joy of just harassing someone like this.

Can anyone enlighten me to why this is an enjoyable way to play?