That alone shouldn’t cast the entire fact into doubt. Consider the situation you were responding to. Whether you believe in the efficacy of vaccines, does being manipulated into believing one way or the other change the actual efficacy? It doesn’t. If you were manipulated into believing they work and got one, then only realize later you were manipulated, you might want to first scrutinize the actual method used to manipulate you. Did they bait you with emotional pleas (think of the children!)? Did they emasculate you? Did they compliment you?

Then understand why this tactics worked on you.