For the record, as far as I can tell, none of the “Aussie Trolls” have the same IP address, they all have similar IPs (same prefix), and all point to Melbourne, Australia according to the lookup but they all have different IPs. The posters themselves change their own IP often as well so it seems he/she/they are using a service that is constantly switching IPs. This could be a normal ISP thing or they might be using a library or something. This is very normal, nothing suspicious about it.
Jothar was ASSUMING that these “Aussie Trolls” were all using the same IP, when you assume…
I still think that they are all the same person or few people considering their very similar style.