As noted, this is likely an issue of attention grabbing. That being said, I can’t understand anyone that would take this tactic. The atheist part I can actually understand, I was there myself once. However, even during those dark times in my life, I could recognize when someone was doing good in the world, regardless of their motivation for doing so. By any standard one wishes to use, Blessed Teresa was a wonderful women doing great things for needy people.
During my dark times, I filled my emptiness with drinking and other vice. As one of the guys who went through RCIA with me put it, I was hanging out and partying with the Devil. I did this for well over a decade (1991 - 2004 are a bit blur), not knowing at the time that what I was doing was chasing after something that did not exist. I knew I wanted love, I had gotten that far, and this might sound crazy to some people, but if it were not for my dog and my responsibility to take care of him, I might have ended my own life. I contemplated it more than once. My dog, may he rest in peace, was God’s way of showing me that there was love in the world, unselfish and trusting love, and it gave me something to live for. My wife, whom I met in 2004, was God’s way of leading me into the light; again, something I did not know or recognize at the time.
What I did not know at the time is that authentic love only comes from the grace of God. That is, in all probability, where these people are at now. They have a massive emptiness in their lives, but they barely even know it. In their case, to consider filling it with actions such as these, the void must be almost overwhelming.
We need to pray for them.