So if 90% are vaccinated, why are rates still increasing? Could it be their vaccine doesn't work as well as they'd made people believe...but no, we'll blame the ones that are refusing to take the vaccine (even though most of those have probably developed natural antibodies anyway)
Firstly, they’re not still rising. Hopefully the current decline will continue.
Secondly, there has always been clarity that the vaccines are not perfect (no vaccine is), and that they are absolutely brilliant at their primary purpose of preventing serious illness and death, and good at preventing infections. They were better at preventing infections before delta, but even with delta they prevent the majority.
Scientists and doctors, including the CSA and the CMO but also including independent scientists and those critical of the government were always clear that we would have an exit wave, even without waning vaccine effectiveness. The transmissibility of delta and reduced effectiveness against it are major factors.
The high level of infections when we dropped restrictions meant the exit wave is commensurately higher - more circulating virus means more opportunities to infect the unvaccinated and for breakthrough infections, particularly in high risk settings like household contact.
The exit wave is following a fairly predictable model; helped by the fact that the government fucked up the rollout to teenagers. That delay has been a factor in the current wave being largely concentrated in younger teens and the demographic of their household contacts (and increasing evidence eg income bracket alignment that these are very likely to be their parents.)
None of this is in any way secret, it has been well publicised. These figures have been discussed multiple times on this thread. Who are the ‘they’ you are referring to??