Because you're falling for the same wishy washy propaganda they used to make everyone afraid of Covid. The data suggests that a negative reaction is very rare, like more likely to be struck by lightning rare. Yes, there have been a few serious negative reactions that are probably from them, but hundreds of millions of people have taken it and are fine.

So you're left with long term side effects. "Everyone taking it will be sterile!" type of stuff, which is just guessing. It's possible, I'll give you that. But I find it unlikely because if that's the case, we've lost. All of society is about to collapse. Stop arguing on the internet and go prepare. But I don't think this is the reality, because the best is yet to come.