Hillary, as Secretary of State, had an unauthorized email server running from a household bathroom that was being used to transmit classified material (that she lied about).
If not technically incompetent, then sure - how about woefully ignorant, deceitful & corrupt and in no position to take lead role of the world's most powerful country. And that is not even taking into account the beef in the leaked emails, for example there are a lot of very curious tidbits in there not limited to the omnimous "I'm definitely for making an example of a suspected leaker"[0] statement by her campaign manager John Podesta.
I don't know how any 'hacker' could honestly endorse this person, let alone the president of YC. No personal offense to Sam. I dont' judge people based on political opinion (especially cause an opinion is malleable; it can change and as such people shouldn't be judged based on them) but do like to point out anomalies & contradictions.
[0]https://wikileaks.org/podesta-emails/emailid/36082