I understand your frustration at the terrible things that happen to animals, Kylie. We all share that sadness at what goes on. There could be many reasons why people are not signing petitions... especially at this time of year - when so many people are away from their computers and on holidays. Of course, there are also so many other ways that people can help speak up for animals, so I'd be careful to jump to conclusions and accuse others of not caring.
I can see that things are getting a little heated here. I'd encourage everyone to keep in mind that it's easy to read more into posts than is intended by the poster. Please also keep in mind that we're all on the same team. However we choose to make a difference for animals, we all care about animals and want see them free from cruelty. Attacking each other and criticising others for the way they choose to take action is sadly only going to make people feel less comfortable about getting involved at all (for fear of being attacked themselves) and doesn't help to create a supportive and collaborative environment that can create change for animals.
As a bit of an aside, I've found that petitions have the most potential for making an impact when they allow the signers to send an email to the target of the petition. You'll see that usually when AA or Unleashed create an action we usually allow people to send a personalised email to the target of the action. Fortunately some petition sites also give people this option, for example
www.Change.org. So I'd recommend when setting up petitions that you check for that functionality to maximise the impact you can have with your petitions.
In the years I've been campaigning for animals I've found that petitions (like those that allow you to email targets) can, at times, be a valuable tool for campaigning. They usually are most effective when not used in isolation, but rather to compliment a range of other strategies (such as offline campaign efforts) to bring about change. And so if someone is more involved in offline campaigning, then I say all power to them. Just as I would congratulate anyone who takes the time to support campaigns online. We're all working towards the same goal after all.