Also called Irrelevant Conclusion, the ignoratio elenchi fallacy reaches a relevant conclusion but misses the point. Though the claims and conclusion may be logically valid, they do not address the point in question.
Hippos can't be dangerous to humans, because they are so calm and look so cute. (Proving an irrelevant conclusion. Also interesting to note, that of all animals, hippos cause the highest number of human deaths in Africa.)