Pen testing in GNU systems?

I was reading and rereading the message in question and as far as I can
tell, I can sarcastically say that these are no security tools. ;)

Security through being non-(free/libre) software isn't good.

name at domain writes:

> I have appended the BlackArch repo into Parabola, but by installing
> some security tools, I am facing nonfree deps preventing my
> installatons, though tools themselves are free (same problem as Deb
> contrib), these nonfree deps are including vBox. I have also appended
> Linux-libre into my Kali system w disabling every nonfree
> components. Is this a good idea same as pen testing under freedom?
>

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