It is not analogous to the upturned cross (which is a symbol of rebellion against Christian culture), and is not “anti-Wiccan.”In modern Satanic theology, the pentagram is far more likely to represent the individual, or the choice to pursue individual glory or immortality rather than union or absorption with the divine- where some traditions advocate the sublimation of the ego or submission to god, Satanism exalts and glorifies it, deifying the human being.
Christian Kabbalists of the renaissance were especially enamored of the pentagram, which they viewed as a mystical proof of the divinity of Christ – to them, it symbolized Christ as the Holy Spirit manifest in the flesh.
A favorite gematric feat was to add the Hebrew letter Shin (symbolizing fire and the holy spirit of Pentecost) to the Biblical four letter name of God (YHVH, most commonly [and incorrectly] pronounced ‘Jehovah’) yielding YHSh VH- Y’heshua, or Jesus.
In most Wiccan and Neopagan traditions, its symbolic meaning is derived from Ceremonial magick and nineteenth century occultism- the four elements ruled by the spirit- although as these theologies mature, they have added to its meaning.
A “point down” pentacle is nothing new- nor is it necessarily Satanic when it appears as such.
Historical depictions of the pentagram were as likely to be points down as point up.