the only reason the pentagram has received a bad rap is because of Christianity. the pentagram has been a symbol of protection for many centuries, common among all sorts of old religions. but when roman politricks came up with the stories for the new testament & the bloodbath of christian crusaders occured in the middle ages, everything got thrown out of proportion, and now anything that represents a "false idol" is considered satanic. notice how BORING the bible is-- that's because anything creative is satanic. you are not supposed to create, that is what Lucifer did and was thrown out of Heaven for.
we are all satanic because satan represents that aspect of reality which had fallen from grace with God, or as Theosophists will tell you, that aspect of reality which became material, or the physical manifestation of spirit. (read up on the Merkaba myths, sacred geometry, & numerology for more detail).
think of this 666, number of the beast crap: the star of David (often referred to as the jewish star because of it's sacred geometrical patterns & connotations to jews) has six points, six sections under each point and a hexagon in the middle. so basically, christians are saying Jews are satanic. BULL-SHIT, if you ask me.
anyway, there is no big evil being with horns and hoofs that is responsible for the terrible actions of men. that is a cop out in which world rulers have provided in the form of Christianity to tote along with the bible in order to retain political dominance. christians stole the symbol of the cross from early Celtic pagan religions, not to mention Easter (Beltane), Christmas (Yule), the 12 apostles (zodiac signs) and the like. hell, i'd even doubt christ was a real person, but i've already said too much.
my point is that the pentagram is most definitely NOT evil. on the contrary it's a very positive symbol, no matter how it's displayed.
from Aleister Crowley's Magick in Theory & Practice:
"The attributes of Five are Energy and Justice."
http://www.hermetic.com/crowley/aba/chap0.html