Presumably more people are getting sick and dying in the control group. People can understand "more people dead" even without taking a genetics course.
In the Pfizer mRNA vaccine clinical trial there were actually more deaths in the vaccine group than the control group, but the sample size wasn't large enough to draw any conclusions from this.
There is nothing so obvious that people cannot fail to understand if sufficiently motivated.
So, 3/4 vaccines went from safe to "clot shots" in just a few months.
> Simonovič presented the composition of the five-member commission, namely, three doctors (neurologist, infectologist and vascular specialist), a pharmacologist and Zoran Simonovič, a representative of the epidemiological profession. The commission reviewed the medical records of a 20-year-old patient who developed thrombosis with thrombocytopenia syndrome following vaccination. The documentation included a treatment procedure as of the admission to the Clinical Department of Neurology in Ljubljana and a health record obtained from the patient’s personal doctor.
> The commission confirmed thrombosis with thrombocytopenia or vaccine-induced immune thrombotic thrombocytopenia. All criteria were met for the fulfilment of the diagnosis. Upon examining the medical records before the vaccination, the commission established that no conditions had been identified in the patient that could indicate problems after vaccine administration. “The commission unanimously assessed that there was a direct link between the vaccination with Janssen Johnson & Johnson and the tragic complication, i.e. the onset of the syndrome”, said Simonovič.
That said they also lost track of or dropped 500-1000 people from that 40,000 sample.
Multiple people died over the course of the efficacy study for the BioNTech/Pfizer vaccine, and yet they completed the study: https://www.nejm.org/doi/full/10.1056/nejmoa2034577
In general, what you claim would seem both surprising and impractical to me. There are many studies on very seriously ill groups, where the death of a large portion of participants is expected.
You realize people die all the time? Even when participating in clinical trials?