Now tell the one about growing hornsThe side effects from the MRNA instructions you are injecting willingly into your body are down the road 9+ months in the form of auto immune deficiencies. Every time you catch a slight cold, the instructions will tell your body it’s Corona Virus and you’re body will over react again and again and again until it shuts down and you die. This is the reason it was never approved for human use.
Now tell the one about growing horns
It's more likely than not that immunity lasts longer than 6 months, they just don't know for sure at this point since the testing of vaccinated people hasn't extended far enough into the future yet. If an additional booster is needed, it would more than likely be due to a new variant of the virus coming into play and not because of diminishing immunity.