And if they work for NSA- whose purpose is to subvert others/ protect US communications/ internet etc- then you'd be right to since their technical security is very good, and has to be very good.
If on the other hand they work for Hillary Rodham Clinton or the DNC chances are they're grossly incompetent (but not grossly negligent) rather than elite and their security is very very bad to the extent it barely exists for the former case.
Technically, Bush withdrew from the ABM rather than outright abrogated it. Whether that has any effect on the legitimacy of a President doing it by fiat rather than via senate I have no idea, but he didn't simply tear the agreement up one day and tell the Russians to suck it. He activated the withdrawal clause, withdrew after its notice period, then told the Russians to suck it.
Not necessarily. Sysadmin doesn't necessitate development, could though. Outside of things with NSA, headlines on Snowden says... are still funny. I wonder how much money his new phone case will make though.