To be honest, they didn’t make it easy to find

Logic gates are hardware, not software

While WinRAR is pretty great, it has also had several severe security vulnerabilities over the years, including one last year:

https://en.wikipedia.org/wiki/WinRAR#Security

Which isn’t quite what you’d expect from “perfect” software

The 2021 release of Tex included several bug-fixes, so not quite 12 years:

https://tug.org/texmfbug/tuneup21bugs.html

See also the following list of potential bugs, that may be included in the planned 2029 release of Tex:

https://tug.org/texmfbug/newbug.html

That said, Tex is still an impressive piece of software

He has made a large number of questionable comments, including the argument that the solution to human trafficking includes legalizing child prostitution:

27 April 2015 (Human Trafficking Act)

The Senate’s Victims of Human Trafficking Act is dangerous in several ways.

When it talks about having the customs agency do more to enforce “intellectual property”, I am sure that refers to something bad. Whenever that term is used, something nasty is afoot.

The way to protect children from being forced into prostitution is to legalize prostitution by licensed prostitutes. Customers could be required to check the prostitute’s license. If the customer fails to check, that concrete omission would be legitimate grounds for punishment.

Minors should not be denied prostitution licenses in a blanket way, but the state should ask them why they want one and probe their situation, then offer help so they can avoid prostitution.

https://www.stallman.org/archives/2015-mar-jun.html#27_April_2015_(Human_Traffickting_Act)

Frankly, it sounds like neither of the two should lead the FSF