Freeing Prowlers is actually a very good idea, if one wants to decrease control. But then I suggest to give the poor Prowler (or Abomination) a stealth armor first (eventhough also a duraplate or HULC armor has some effect, but then the best results are with a stealth armor). An initial control value of 10 and one freed abomination with a stealth armor reduces control by 3 (duraplate/HULC by 2), a freed abomination with any other armor (than duraplate/HULC/stealth) does reduce control by 1 (unarmored counts as any other armor). Considering that there is no real lower bound for control reduction this way and the costs of a stealth armor (and the money one could get by donating a prowler to HUNT research) and comparing it to the cost of reducing control via donations to the Bandit faction, it is a pretty good deal to free prowlers (after giving them a stealth armor to wear).
Sadly there is currently no infinite supply of Abominations to capture and let lose on Ikaanos (and breeding abominations does not actually work just yet - aside most folks probably would only want to breed male prowlers and not tainting females, especially unique females).