Just think of it. Harry Potter was a horcrux himself. Like Ron, after being exposed to a horcrux for 5 minutes, turns rotten and horrible. The Dursley's were exposed to Harry for 10 years. So the Dursleys could have possibly just been under the influence of dark forces.
A/N:
Btw this theory isn't mine. That's all I have to say ^-^
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Potter 101
RandomWelcome to Potter 101! Here, you can discover interesting, weird, or funny facts, quotes and theories about the movie and book series Harry Potter! Thank you for reading and voting~! I really appreciate it!