Even if you just compare the case numbers in South Africa to the UK (where most are double or triple vaxed) you get a good idea of how well vaccines are working.
For example, in South Africa deaths have gone from about ~15 a day before omicron to ~30 a day since the variant was first identified, which is terrifying. And in South Africa they have around 20,000 new cases a day compared to about 80,000 in the UK -- imagine how much worse it would be in the UK right now if they weren't vaccinated.
Anyone still doubting the efficacy of triple vaccination in healthy populations really needs to look at the data. The South African health authorities are wrong, omicron is a serious threat to our health and if we must fire a few people to ensure another successful Pfizer vaccine rollout, then so be it.
Apologies for the sarcasm, but as some with COVID antibodies from a prior infection which I recovered from in about a day, I am genuinely getting frustrated by how much fear and pressure the government is pushing on me to get vaccinated every few months, when the data on how effective they are at managing the pandemic (even after several doses) seems completely inconclusive. Even if this booster did prevent infection by any substantial amount, are we sure we all need them? And further, are we sure the risk justifies governments and employers pushing them on us via the rollout of various mandates and health passports?