The mission was not only to go in the kill the scientist, it was to eliminate the people who had done the mission to kill the scientist to hide the whole operation with the scientist, so that it had zero loose ends.
The guys who came after Pine to eliminate him and his team were one level removed from the scientist mission, so once Pine's team was gone, there were no living leads back to the scientist, except Kiefer's character who originated it.
4 months ago
Except the Foster character came back without issue.
3 months ago
Exactly. So Foster was cool but not Pine? I don't get it either. Maybe Kiefer didn't plan on killing everyone, it just ended up happening as a result of the Berlin debacle with the police.