We should tell them to stop collecting royalties for their books and taking money for their talks. After all, they did not actually write them or are actually formulating those ideas. They were led by the invisible hand of random chemical reactions in their brains to put out those words, which ultimately, must also be meaningless. Be consistent atheists!About the free will thing, I noticed that for a few years that's been a big trend of atheists to start embracing the notion that free will is an illusion. Sam Harris is the person that really seems to have popularized the idea with the atheist crowd but the idea was already popular with a lot of people who were either New Atheists or on a similar wavelength as them.
The strange thing is that these people are also the ones screaming the loudest about the importance of truth, reason and science. I don't have see how truth can ever be arrived at if we're at the mercy of inputs from outside of us and our mind just passively accepts it like a wet sponge. Reason goes out the window as well for the same reason. Same goes with a lot of the humanitarian liberal ideas that these atheists love. These ideas are grounded in the individual being able to freely choose their actions and create their own destiny. If there's no free will, it seems like the logical outcome is that society should be like a dystopian 1984 or Brave New World one with a overpowering state that can freely program their citizens since hey - you don't have free will and every part of you is shaped by forces outside of you so having Big Brother determine your very being isn't really any different that happens anyways.
EDIT: Now that I think about it, I think Sam Harris actually has promoted 1984ish policies such as developing technology that allows to peer into people's minds to see what they are thinking so it can be determined if they are lying or not. Dawkins has also promoted eugenics. A lot of these New Atheists in addition to being liberals are also tech-utopians so they are attracted to these big scientific projects to "perfect" humanity. These sort of projects often clash with liberal ideals so every and now and then, you see the contradictions bubble up when one of these people are vomiting out ideas on Twitter or a podcast.