Firing someone is not taking their life from them.
Also, firing someone is taking their livelihood from them. rms might be more comfortable than the average worker, but part of the reason there are special rules around work is in society today people need to work to survive. rms might be wealthy and have a cushion, I have no idea and so this might not apply to him. On the other hand however, free software has been his life's work, and he is being forced out of the organizations he started in order to further that cause. He probably will be hampered from ever contributing to free software moving forward. It might not be on the level of a walmart worker living paycheck to paycheck (which sure is a larger problem) but it is a wrong, at some level, to him if he is not offered a better deal or a chance to change.
https://geekfeminism.wikia.org/wiki/Richard_Stallman
You may not like the source, but they link to actual examples.
It's the leader's responsibility to create an environment that others feel safe joining.
He did a shit job at that.
I'm in a group he had been fine towards, but I've never found him someone I'd like to follow.
His bad behavior is not new, it's been going on for a very long time, why does he need more time to change? His statement on why he left makes it pretty clear he feels like he didn't say anything problematic.
In America at least, we have an entire social safety net intended to avoid that scenario. Doesn't always work as intended, but there are too many counter examples to that simple description to accepted it at face value.
What people often do need work for is self-actualization, money for non-essentials, or to feel like they're making meaningful contributions to society. I don't see anything about RMS stepping down from the FSF that precludes him from submitting patches to whatever open source project he would like, or precludes him from publishing his own thoughts and research on his own website.