It's just a matter of style and consistency. The Oxford comma is the one that you can use after "and" - or not. Publishing houses have their own policies on this, and the Oxford press favours the use of the comma (as does much American writing).
It's not wrong to use it or to omit it, but there are times when clarity requires it. "I would like to acknowledge the support I've received from my parents, my teacher, and the vicar," is clear, but try leaving out the last comma and you begin to wonder who the speaker's parents were!"
It makes me mad the way legal documents omit commas on the grounds that they might cause confusion or be forged. After all, they still use full stops! The comma is there to aid clarity and communication.