I think it’s important to know the company who are going to give out the Vaccine !! 
I’m not antivax but if the company has no liability then they have no trust in their product. Would you buy a kettle without a guarantee? 
 Pfizer - Drug Manufacturers History, Products & Lawsuits see the sources under the article British Medical Journal on the trial. it’s interesting who got tested in the trial! 
 Covid-19: Vaccine candidate may be more than 90% effective, interim results indicate | The BMJ