"We can do what we want with artifacts our agents retrieved, there is no point in hiding these technologies, if we dont leak them, the Men in Black, will, in unregulated amounts, to highest bidder. The Men in Black some of you help to finance. Ignorance damms progress and these gardens will expand humanities knowledge of bioweapons by decades and it doesn't truly matter that you found us out, one way or other these gardens will get to the secret syndicates and terrorist organisations, we wont just stockpile it, we dont have space for it, we dont have armies to arm them with bioweapons and we cannot leave these gardens there, if we wont retrieve them, someone else will so you shouldn't be as angry at us, blame the game, not the player".
* Addendum - Also because the general public is/will be aware of these chemicals being widespread, humanity can also create medicine directly made to counter these chemicals so when aliens use them on innocents, we wont have to stand aside and watch victims melt in to a puddle.
