The vaccines are not shown to be (may be) safe outside of a brief few month window (for specific classes of people). These are a new class of vaccine and there appears to be significant risk based on the cdc data (VAERS).
https://austingwalters.com/covid19-vaccine-risks/
To be clear none of the vaccines really completed a standard phase 2 or 3 trial. It had an abridged or expedited version that skipped things like pregnant women, etc. the vaccine is also not 100% effective, which is important as it’s a “leaky” vaccine. Meaning, we’re going to see lots of variants that get around our protection from the vaccine. That’s why treatments are important.
It’s also possible we see genetic defects 2-3 years from now or an increase in cancer. We really have no idea.
In those millions we are missing the number of people that get seriously harmed, and killed due to getting the vaccine. So we do not know it is 100% safe, we only know that it is mostly safe, which is not good enough to be cheery and happy about it.
Further, if there are viable alternative treatments we shouldn’t be using a vaccine still in phase 2/3 trials that haven’t even been tested on animals... the entire emergency use authorization is only allowed if there aren’t safe alternatives.
Ivermectin is generally safe to take, and a known drug with known risks. If it was shown to be effective the vaccine rollouts should be stopped. So, there’s a lot of political and financial reasons to not publicize it.