I have been involved with FIRST for seven years. So I think I can say there probably been at least one or two worse calls in FIRST history.

Firstly refs are human, the rules this year are complicated. I was head inspector at SVR, and all the rules and documentaion come in two Phone Book sized volumes. When your trying to make a quick decision on a complicated action, sometimes you can't put your finger on the correct rule.
I think the discussion between the Head Ref and the regional director was about that exact wording of the rule or rule number to explain the infraction.
I know this because after the match I was asked specifically if I knew the 'rule number' for the penalty assessed for pushing another robot and causing an unsafe condition.

Now I am a mentor for 254 - so I can't claim to be impartial, but I was on the field at the time of the action, on the opposit corner from the site of the infraction. What I saw was a red robot push 254 into another red robot that was in the human loading zone. I did not see a flag thrown either - but I wasn't in a position to see a flag of any color on the floor.

My understanding (opinion) of what the reason for the penalty was, by pushing a blue robot into a red robot, the red alliance was causing an unsafe condition, and the possibilty that a human (red) player would get hurt. (I believe this is called "causing a cascade.") Whether this is fair or not or deserved a 30 point penalty, I'll leave it up to others to decide. Now I don't like winning because of a penalty or questionable call, and I like losing because of one even less. Sometimes it happens. I don't think this was a bad call, but bad calls and mistakes are part of any game - you need to accept it and move on.