New guy here, in all honesty wanting to affect development for the fluff at the very least to fit taste of me and people not unlike me. So kinda the same most of you do here. No need to greet me.
Now, about the topic at hand - I actually like the original idea of things like cattle mutilation and crop circles being explained. It may seem silly? Sure, and thus I don't see why after some basic research or whatever it shouldn't be possible to confirm subject's sillyness. Even better, there could be a report of inconclusive results suggesting cult activity or some other occult workings. Possibly ancient religious practice. I remind you all that crop circles and whatever happen IRL so mentioning them only adds to actual immersion, it's how they are mentioned and in what context that may affect the game negatively. I have enough faith in developers to make an assumption they wouldn't mess such up. Mentioning of it being possible effect of other, unknown alien race not directly connected to assailants I would find especially interesting as one of the things that seemed rather silly in some x-com related products was the fact that suddenly any and every alien race in the world went hostile against some primitives on already quite abused planet (Earth, I mean).
Also, because I feel like so and actually find this topic interesting, my own take on one thing:
In regards to Gorlom and his view on major plot enemy of newer UFO series (yes, you had your saying about the topic, guys, I feel like I have the right to have it too - and you have a right to ignore it after all):
In regards to their peculiar reproduction cycle - yes, it is silly but very much NOT impossible to not work out. Given we lack quite some informations about those organisms thorough the game, you cannot really tell how many of those possibly there are and how often events such as the one endangering the Earth is happening. If said creatures reproduce once a few thousands of years then given how vast space is, it's very much possible taht there is indeed enough intelligent life that some planet dying here or there is of really little importance. Hell, thorough history of the universe novas go off destroying far more than one planet yet somehow despite how long it took from theoretical beginning of the universe, we still have plenty of worlds to go around and lately some that can be presumed to be habitable by humans were found too, even though we require rather exact (by comparison with what can be found in the universe) environment to survive.
As far as their intelligence, no one said those are trully intelligent. Too much of traditional connecting of mind powers with high intelligence. For all thing's involved, said horny comets have no more intelligence than some plant, but plain enough 'force under the hood' to bend minds of more intelligent creatures to their generic goals. Especially as it seems it's all subconscious as even official fluff stated that all affected races believed they have their own objective which they are following. Their judgement was clouded. So actually clever subversion and planning to make anyone part of comet's scheme is not necessary. Victims do all the thinking themselves.
Last thing, about how suspicious notion of general world-destroying horny comets seem. Yes, again, it is silly. But as you've noticed, there's also a subject of intelligent design. And I don't mean any deities here. It's just possible that Myrmecols were made as some weaponry by race predating times from the game by millenia, during which said weapon changed and spread on it's own.
In the end, it's not much more silly than intelligent hive-mind bacteria able to take over different races of very different biology. Yet with universe being so, so big there's enough space for such that even my meager willing suspension of disbelief had completely no problem with just aforementioned idea in original X-com series.
tl;dr: Read it or consider leaving. I was informed it's forum for somewhat intelligent people. Given that I don't plan to post everywhere and everything you can stomach such post once in a time. And skip parts that don't interest you.