Pointing out that the vax is really gene therapy is too fine a distinction. Normie goes "no it's a vax because that's what the media calls it" and then you're bogged down trying to explain how it really is gene therapy and the normie doesn't even care because gene therapy sounds futuristic anyway. Better to point out it was hastily developed and the pharma companies can't get sued if you get hurt. Play the "big pharma is corrupt" angle which is well established in the culture and plays well. The gene therapy angle is true, but the yield is low.