I've read about some aggressive aliens before, it's astonishing that there are many people in ufology who do not think there are any aggressive or hostile aliens out there...The reasoning I've heard is that we would have been conquered already but that's shortsighted reasoning, simply put those type aliens may not know about us yet or we are far too primitive to waste resources on, there could be other reasons...
Also we shouldn't just blindly trust allegedly peaceful aliens either, even if they have the best of intentions, what they do could have harmful far reaching effects unforeseen...We really need to be very careful in any dealings with aliens, no matter how peaceful they may appear on the surface...We know nothing about them at all and it may take years just to understand them enough to know their true intent...
...
From reading countless stories and quite a few far fetched ones this is what I would say.
1) Aliens are very disciplined, but can be temperamental when confronted.
2) Aliens follow some kind of general regulations.
3) Based on our own science, Milky Way contains between
30 and 50 different civilizations, society types, cultures, technological levels, etc.
4) Some aliens abduct people and then release them unharmed.
5)
Some aliens capture and dismember people, most likely for science.
Because there is 30 to 50 alien civilizations in Milky Way, there must be some kind of coordination between themselves about sharing resources, avoiding conflicts etc.
Speaking purely scientifically 1) to 5) makes sense
purely on a resource availability basis. Probably only 1 in 20 of planets is good for an evolution of hominids, which means that 19 planets are available as source of resources. In other words, there are unlimited quantities of iron, coal, oil, diamonds, gold, platinum, and whatnot in the universe that
no civilization really needs to colonize another one. All civilizations that are ahead of use most likely use robots, as we are beginning to do, as a cheaper than human labor.
Because
Milky Way's resources are plentiful, so readily accessible and cheap to extract for aliens, they don't really have an economic need to colonize somebody. So it is very likely to expect that there is an agreement, sort of Milky Way United Nations, that lesser developed species should be left alone to develop. Something like international laws protect wales because we don't really need wales for lamp oil anymore, but Japanese take the liberty to kill 800 each year for "scientific purposes".
The only real interest in us is scientific and medical. Our planet and indeed ourselves might be interesting to them for the genetic pool. Same as we use genes from sea urchins to make new medicines, they might as well. Another thing is they can
use our females as surrogate mothers for the breeding of some kind of man-made clones, as a form of advanced agriculture. Obviously, they wouldn't want to subject their own womenfolk to that procedure.
aggressive or hostile aliens out there
That's where politics will come in. We'll make friends with friendly ones and they might keep hostile ones at a bay, in exchange for few surrogate wombs
.
In essence, we need to find what are these rules that other civilizations adhere to, plug in and swim along with everybody else. We'll definitely be the newbies and have the least influence of all.