That's the problem with petition websites. Something happens, 50 petitions for the same thing come up, and if you want to take it the same way as legal matters, you can't just go merging votes. Wordings could be different, lending to slightly different ideas, and everyone would have to agree again. Then you could have dumb reasons like hating the original person to submit or something. And simply removing petitions and redirecting to revote is also a conflict, especially since people aren't as likely to return to place their voice.