In what way is it worse?

What if he's scored as a threat and reported to the FBI? A human can understand sarcasm, jokes, or hyperbole. An algorithm is going to see scary words and add them to the 'dangerous' score.

> What if he's scored as a threat and reported to the FBI?

Then he'll be referred to a human, who may or may not understand sarcasm, jokes, or hyperbole?

'May not' seems likely, we are talking about the FBI after all ;)