There's a pretty interesting study from Denmark, that says after six months vaccinated people (two shots) have more risk of getting Omicron specifically, than unvaccinated people.
From the authors of the study:
"The negative estimates in the final period arguably suggest different behaviour and/or exposure patterns in the vaccinated and unvaccinated cohorts causing underestimation of the VE. This was likely the result of Omicron spreading rapidly initially through single (super-spreading) events causing many infections among young, vaccinated individuals."
Yes, that's a plausible explanation.
It was plausible for any earlier paper about vaccinated vs. unvaccinated, though. There are a lot of confounders between these two groups.
Remember the whole "get vaccinated and then you can ditch the mask" bit?
Nonsense. Mask up and avoid unnecessary crowds if you want to avoid infection
Let's try to stay on topic, which is whether boosters make omnicron spread faster or slower. The answer is unknown, but it's a fact. The fact won't depend on someone else doing what you think they should or not. You have identified a statistical confounder, but adding a weird moral element to the confounder is off topic and prevents most people from thinking clearly.
We know a mechanism that could make boosters seem to worsen omnicron when they don't: risk compensation.
We know a mechanism that could make boosters actually worsen omnicron: OAS.
Why are you jumping to conclusions?
Most unvaccinated vs. vaccinated studies are riddled with serious confounders: age, obesity, and serious comorbidity. They use long time windows spanning multiple variants, and play other denominator games to get the result they want, if you'll remember "99% unvaccinated."
Only when you get the result you don't want do you become interested in confounders and denominators, and you seize on a warning in the paper as if it's certainty. The right reaction is UNcertainty. You should be saying, "I acknowledge vaccines worsening omnicron spread might be a problem, but it's still unproven. At least we can say the vaccine is much weaker against this variant, and it was already weak enough at preventing spread of delta (40% - 60% according to CDC on July 29th) that full vaccination would not lead to extinction: R0 was greater than vaccine's effectiveness. Omnicron has higher R0 and less effective vaccine, so we should do further investigation to make sure we're not making things worse, and we should not use vaccination boosters as a tool to control spread of Omnicron. If we use them, it should be knowing the risk they might make the spread faster and certainly won't make it much slower."
I don't think the endless booster plan is medically sane for the individual. It would need a lot more evidence of benefit before I'd be interested in following it. Others can reach different conclusions, but my conclusion is very reasonable because there isn't enough evidence of benefit. For the group, there's no benefit at all: someone else's vaccine does not affect you because you will eventually be challenged by the virus, probably pretty soon, regardless of vaccination or boost uptake, considering everything we know and the error bars on our knowledge. It's no part of a plan with an exit strategy.
There's no such thing as informed consent without the right to weigh the evidence and make an unforced choice. While the Denmark study doesn't settle the matter, it underscores this point powerfully: your unproven speculation should not be treated as conclusive and backed with force, as was done in Israel.