I just don't get their "suppression" angle when it comes to things like this. The government wants to hide that Diprotodon isn't extinct because.... why exactly? If that's the case how does any new species or rediscovered species get announced - surely they would all be suppressed?
Neil Waters just had a new article about Adelaide thylacines in one of the papers (No Cookies | The Advertiser) and in it he is saying that the reason scientists won't admit that they know the mainland thylacines are still extant is either because they "are keeping the fact hidden in an effort to protect them, or that they’re simply too embarrassed to admit that they were wrong." That is his actual theory - that there is too much embarrassment for any zoologist to become famous for proving thylacines still exist. It's beyond idiotic.
Suppression, denial, dark forces in industry and government, closed minded science, they're all essential elements of a typical cryptozoological plot.
You can do what you like if you stick to this format.