I've recently started GM'ing a campaign and until last session it never occurred to me that Space Marines don't get at least the basic tech-use. So after considering it I decided to give the PC's the basic tech-use, one of the players however objected ans suggested that the reasons why Marines dont have to worry about tech-use because they have Techmarines and Artificers and that as soldiers they wouldn't have been trained in such things because the Techmarines can do it, using the example they wouldnt know how to get a fusion reactor (or something similar) to explode.
I hit back by saying that Marines aren't line soldiers but genetically enhanced super soldiers who are trained to levels that we can only dream of. I said that they'd have the intellect to deal with unusual technologies especially as they are serving with the deathwatch and that they would know how to rig a fusion reactor to explode but I would put greater penalties on rigging a reactor to explode that getting a auspex to work in an electrical storm or getting the electrics up in an abandoned building, there were other reasons given by both of us but i can't remember what they were exactly.
So I wonder what are your views on this? I know each gm has their own method and that Rule 0 is don't argue with the gm but is the pc right and I'm missing the point or is my reasoning valid enough to give marines tech-use?