Script kiddies
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Devs tend to forget that they get paid so much because they know things most don't. If everyone was comfortable with things that seem simple to them like running a git install, devs wouldn't be as sought after.
Obligatory relevant xkcd
Most devs on github don't get paid
Most devs on github are not living out of a cardboard box. They have day jobs.
And their repo is not part of their work.
I don't think in this case, they forgot. It might be for the better to keep explosives out of the hands of "non-experts".