There are very few, if any, Australians on this forum. There's a very good chance none of those 25 people were Australian. Some random petition on a website isn't likely to have any effect either.
Maybe I am the first Aussie to read Alan's request but there are a few of us here.
I get a request to sign a petition at least every day. Most of them I ignore. When you do sign you get on a mailing list and then you must unsubscribe. Then I have to unsubscribe from mailing lists from petitions my husband signs. He does not believe in unsubscribing, just deleting.
In some cases it is worthwhile to sign, but those occasions are rare. I don't think this is one.