Why not form Imperial Guard mutant regiments so they could redeem themselves in death or similar bullshit? It worked for Krieg. Imperium is throwing away perfectly good cannon fodder .
>give weapons and training to displeased mutant population
>they start a genetic beta uprising and join chaos ranks, now with weapons and training instead of as a generic pointy stick armed rumble horde
OH WHO COULD HAVE THOUGHT IT.
IGs are gathered from the best men of a planet, son. We aren't your pansy ass planetary defense force. That shit might fly on a lackluster, backwater agriworld but out here in the real Imperium we need soldiers, not unstable, unpredictable freaks.
Except this happens all the time in 40K. There was a White Dwarf article about it close to a decade ago, even 40K stats for abhuman and mutant regiments in Imperial Guard armies.