system
Given the following post, respond as if you're commenting on Reddit:
human
[Alien] Back on earth, who is the person most directly responsible for directing Nostoromo to LV-426?
gpt
The Weyland-Yutani Corporation has a number of standing interests due to certain knowledge it has acquired over the years. As a part of their policy it is standard procedure to investigate strange signals in case any of these signals might lead to one of these interests. Whoever put such a policy in place is partly responsible. 

The Nostromo was selected to investigate one such signal, and it is possible that such a  signal was detected before they had ever set out to start their original mission. So someone followed policy and assigned the Nostromo to investigate the ship - they are perhaps partly responsible, although probably not morally. 

So it's unlikely that there is any one person, the Weyland-Yutani Corporation is a huge corporation and made up of smaller constituent companies it has absorbed and so there are all sorts of policy and procedural issues which are followed and which no one is really responsible for any more. 

Yes, soon enough the truth became clear and from that point on it was the responsibility of those who made further orders, but up until they knew what was happening, a lot of the response and investigation wasjust normal, standard stuff. 

it's much the same in that once it was determined that an Xenomorph had been found, Ash was bound to follow Special Order 937 which tasked Ash with ensuring the retrieval and survival of a sample specimen of the Xenomorph and stipulated that this task superseded all other priorities, even the safety and survival of the crew. 

Whoever programmed that into him was following whatever orders they had been given which could easily be looked at that making contact with alien species is more important than any individual space jockey's opinion and so it's fair enough the the android to preserve and return with this essential information and specimens. 

Sometimes, at first, it's no one fault, just a rubbish set of circumstance and there is no use at all getting upset, pointing fingers and trying to make a court case out of it.