Christian Churches believe that animal sacrifices to other gods are wrong, they are backing for the constitutional freedom of those people to worship their gods without gov't interference.
John Kerry* believes abortion to be wrong, but he also believes that the right to privacy and in particular the right of private medical treatment must be upheld.
(The right of privacy having been held to be behind the 4th (and I believe 1 or 2 other) Amendment by the Supreme Court)
In fact, I have not read anything like an indepth explanation of Kerry's thoughts on this matter, so I am guessing here.
I realize you are Catholic, but perhaps you will find an excerpt of Luther's small Catechism worthy of some consideration.
from
http://www.ucc.org/faith/small.htm [Bolding added by me.]
The Eighth Commandment:
"You shall not bear false witness against your neighbor."
We should love and fear God, and so we should not tell lies about our neighbor, nor betray, slander or defame him, but should apologize for him, speak well for him, and interpret charitably all that he does.
Jumping to conclusions about what other people think, how they view issues, and then spreading those conclusions as fact does not strike me as a good idea.