...and it kills or cripples the other 5%??? That's all they test for in phase 1. Not efficacy, just safety. If it killed or crippled anyone they would not have proceeded to phase 2.
Other way around - Phase 1 is efficacy. If it doesn't work it doesn't go to Phase 2. Phase 2 is to assess best dose / dose frequency. Phase 3 is safety and efficacy.
There is Phase 4 post-marketing for more safety and efficacy data.
Trump’s virus vaccines will save America before inauguration day.
Not according to this https://guides.clarahealth.com/clinical-trial-phases/