Basically, because I am really, really, really far off his radar. So that's easy for me to say.
I just read Should Women Fear Charlie Sheen Now? According to this article, some women should have feared him over a decade ago. Others may have cause to fear him now. I would say the degree of fear is directly correlated with one's physical and emotional proximity to Sheen. He seems to be a tad unstable, must be the drugs talking.
My professional advice: if you happen to see Charlie Sheen coming, just walk the other way.
BUT I also want to emphasize that if a woman does find herself in close proximity to Sheen and he DOES shove her or throw furniture at her (or both), SHE IS NOT TO BLAME. Mr. Sheen, drugs or no drugs, is wholly responsible for his actions and should be held accountable for his choices.