Assuming they have reasonable intellect they would be able to get an idea of what type of species we are.

I don't really think there's intelligent life out there, but if there was it makes sense they would understand the basic principal that it's better to work together. Being mostly stuck on earth we have limited resources, but if you could travel space your resources are practically unlimited.

Our biggest risk would be a dying planet society sending a hail mary ark to save themselves hoping earth was habitable after their world has died. Realistically we've got better odds being taken over by bacteria on Earth.