There's no excuse for threatening an official, even if she did blow the call. Argue, sure...insult...maybe...threaten? no way. That should be on-the-spot-expulsion from the tournament, not simply a one point penealty. She should also be suspended from the next tournament she's signed up for. And a physical threat against someone half your size and unarmed while you're holding a weapon.....real tough honey.
Man! You guys are really something. At no time that I observed did Serena Williams ever do anything that could remotely be thought of as menacing. Yeah. She lost her cool. It's probably a good thing most of you never got to see/hear Leo Durocher get excited.
ML/NJ