There is a reason not to trust.

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When a billionaire is out to do good, but has a split personality in his intent, it is probably best to not trust.  Vaccinating kids for polio?  Super.  It would be good to have that disease gone.  But when the people doing it are planning on reducing the world population, you have to understand that... anything he does is tainted.  You don't know if he is, perhaps, making the vaccine more dangerous, on purpose.  Simply not training the staff he sends out might increase the risk to recipients.  Any man who thinks there are too many of you, but suggests he is there to help improve your health, has to be questioned.

Genocide with a smile is still genocide.  Even if it is randomized, even if it is limited in scope, it simply doesn't matter.  Is that his goal?  I haven't seen proof, one way or the other, but his own words are rather suspicious, at the least.  Even if he actually believes we have hit the apex of world population, and births are declining, does he truly believe that is enough?  The one thing, about people like this?  It's never enough.  You don't become a billionaire by going small.  You also don't give away your hand.  And, most likely, you have learned to not have a conscience.  Some of the things he has done, like teaching African kids to mess around with oral sex, in aids ridden nations, knowing that oral sex almost always leads to actual intercourse, and that condoms don't help prevent the disease, is more than suspicious.  Especially with research easily showing that teaching abstinence actually works, even in African nations.  Genocide, with a happy face, is just... genocide.

While he decries the non-involvement of other billionaires, perhaps he ought to consider that there is a reason they don't get involved in his schemes.  I can see why he would want them in on it.  Something about sinners, especially the worst of them, wanting cohorts.  This guy is nothing but trouble for the poor and weak and should be kept as far from them as possible.  I believe he calls himself a Catholic.  I am pretty sure, where he is headed, that brand will do him no favors.  He won't be alone, but as far as he will understand things, he might as well be.  Even with his wife right there beside him.