The vaccines were never purported to be 100% effective, and all the data and information was clear that they had lower effectiveness against Delta, and even lower against Omicron.

If people told you that the vaccines would lower your chances of contracting every known major variant and lower your chances of a serious illness, they were right. If they told you that the vaccines were guaranteed to completely prevent every variant of the virus, they were lying to you. If you heard the former but interpreted it as the latter, that's on you.