Omicron largely evades immunity from previous infection. You would know this if you extended your research beyond Twitter's conspiracy theory imbeciles.
@danthered1986
@NickyRamone
@piersmorgan
You can't 100% protect the vulnerable, some can't have the vaccine and even those who do its not 100% effective. Best we can do is for everyone eligible to get vaccinated. That includes you if you have no valid medical reason to reject it.