They appear on the side of my home page with other ads and upset me. I don't agree with them (and as an aside am in ireland, the ad is for the irish pro lifers speaking out against abortion, terminations are illegal here) I have had 2 miscarriages in the last year and do not want to see pics of feotuses.
I think a company or organisation can buy access to a certain facebook demographic, in this case Irish women of child bearing age, so their ads will show up on your page. But I'm not sure if you as a facebook user have any rights over which ads are targetted towards you.
It would piss me off too. But hey it's a great day for the island of Ireland as the first abortion clinic opens in Belfast. A step forward.