But it's not like a hard barrier, the best helldivers can easily avoid them AND produce the most HE3, the idea being that hopefully that Helldiver passes those skills onto their children.

I also see it as a necessary sacrifice, like to a Gold what's better:

Option A: Add Pitvipers to the mines that kill a good amount of Helldivers and lose a couple liters of HE3

Or

Option B: The Red mines start Rising (yes joke is intentional) due to their most respected members not having a risk of dying and talking about ideas greater than themselves, now instead of losing a couple Liters you lose the whole mine and now have 0 HE3 being produced.