First of all, there is no voodoo stuff on tarot cards (voodoo is a Haitian religion, which has absolutely nothing to do with tarot cards).
The Major arcana contain pictures with allegorical depictions of a person's psyche, the good the bad and the beautugliful sides of it.
The goathead demon picture (major arcana card 15) symbolizes someone being bound to indulgence preventing a person from growing or becoming healthy—an example might be alcoholism or materialism. On the other hand, however, it can be interpreted as being too calculated, restrained and/or dispassionate and never allowing a rash, wild or ambitious moment.
Before the cards were ever used for divinatin (before the 17th century) the cards were simply used for gaming and gambling. There may have been allegorical and cultural significance attached to them, but beyond that they originally had little mystical or magical import.
Just because you have no clue about what these cards mean/meant does not make them "evil".
Is a Dio record "evil" because the depiction of a devil on the sleeve?
Is Led Zep 4 "evil"?