The idea is that people take tools and words and misuse them all of the time. When Nobel made TNT, he intended it to help people by making it easier for people to get connected by trains. Obviously it didn't work out the way he intended.
The slavery in the US was condoned as God's will from those who felt that slavery was ok'd in the Bible. Does that make the Bible wrong or those who read it the way they wanted to read it wrong?
Likewise, if a person misrepresents what Darwin and others have said, does that make their works wrong, or those who selectively quote from them?
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When all else fails, check the manual