You like the Earth. Perhaps you even find humans tasty. The Earth is an unguarded gem in the night, ready for your picking.

Since harvesters are here to reap goods from the planet, the last thing they want is for it to be liberated, to stand on its own or enter into the Galactic Culture where it would become hands-off to such activities (making it more expensive to operate.

Harvesters can be of (at least) two major types: take it all as fast as possible and get out, or do some controlled harvesting and turn it into a long term asset. The first means grabbing as much and running, and the harvester really doesn't care who he's stepping on in that case. Long term harvesting, however, though far more profitable in the long run would also mean seizing majority (or total) control of the planet first. It's a tough choice...

Harvesters are out for personal profit at the expense of others. even if those others are not seen as sentient or as things having any rights it is still at the expense of their own purposes and pathways in life. Some species are far more likely to be harvesters, and some are quite unlikely.

The most likely are the Draconians, and the Greys. The least likely are the Pleiadians and the Zetas. Rogues, either individuals or small mission groups, also make great harvesters.

Pleiadian harvesters might exist, but they will not likely be as successful at it.

Naturally, Harvesters will not get along with others who want the planet liberated, or who want it for themselves. The missions they are most likely to cooperate with are those are neutral or who want it for themselves but are not likely to succeed at it.

Harvesters and Light Workers don't really get along too well. Harvesters and Gangsters, however, often make good (though temporary) pals

Harvesters are not Highway Men, however, in that Highway Men will go only so far. A harvester is not concerned with whether the "crop can recover" for a future harvesting or not. Highway Men are not that destructive, not that selfish.