I think this comment encapsulates the problem well: laymen who are not involved in the process in any way (on either side) acting like armchair experts and passing harsh judgement. You’re making some very unfair assumptions based on age, and nothing about the actual technical arguments.

This is why people like Martin feel justified going on social media to publicly complain, because they know they’ll get a bunch of yesmen with no credible arguments to mindlessly harrass the developers they disagree with. It’s childish and unproductive, and while I’ve personally respected Martin as a developer for a long time, I don’t believe he’s mature enough to be involved in the Rust for Linux effort (tbf, he’s not the only Rust dev with this attitude). If the project fails, it will be because of this behavior, not because of the “old guys” being stubborn.

Two things can be true at once:

• More Rust in the Linux kernel is good
• Brigading on social media is bad

Open source work is collborative. No matter how good an engineer someone is, if they can’t figure out how work with others, then it’s better to kick them out. A potentially insecure kernel is better than a non-existent one.