You are citing Project Veritas? Project Veritas? Wow. Do you have any idea what that site is about, and its history? The risk from the vaccine is many, many orders of magnitude less than the risk from the virus. Anyone who actually cared about facts would already know this. The number of people "getting seriously messed up" or dying due to the vaccine is vanishlingly small. Look up what VAERS is really about, and what those numbers actually mean. The number of people in the US who have actually died from the vaccine can be counted on one, or maybe two hands.
The reason there are a "large" number of breakthrough cases is because, well, there are a lot of vaccinated people and the virus is still widespread. Do the math.
Your story about your friend who had COVID and cannot get vaccinated is just that: a story. Not true in any sense, since there is nothing about having been infected that prevents one from getting vaccinated. Nothing. Either someone is lying to your friend, your friend is lying to you, or you are lying to us. In any case, you shouldn't be repeating nonsense that you can easily disprove with a few seconds of Internet searching (but skipping Project Veritas).
You need to step back and reassess your sources of "information."