Explenation:
Building roads was a good thing. So Hitler did something good.
But he built them so he could move his armies faster - which caused deaths of many people. The motive was bad.
Hitler is therefor a bad person (even the good things he did prove that).
Still no one can deny he did at least one thing that can be considered good.
To apply that logic to the pope and use of condomes:
The pope forbade the use of condomes (this is very unpopular), which has a negative effect on people.
He forbade it because he wanted people to live less lustfully (the motive is good).
He even offered another way out - which the people couldn't follow, because it was to demanding (not to have sex before marriage and even then only with the same partner - this would stop spreading of AIDS also).
So his motives were good, but the resoult was bad. He might not have solved the problem - mostly because he ofered high ideals instead of practical and quick patch to solve the main problem - spreading of AIDS, but he's by no means not a bad person for it.
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