Real simple.

These folks have to tell you what they are doing to you before they do it to you. They can obfuscate it a bit (leaving a piece here a bit there) but per their bullshit religion they have to tell you what they are doing.

You give most Isrealis a placebo. Those that are trouble or by random chance you give the real thing.

But you have been testing this thing on animals and people for years, so you know the numbers/percentages that will get what side effect or which type of death.

Then you make up the numbers. Then people go: but if it's real why kill their own?

Where's the actual evidence that they killed their own? Their stats that they released? Do you believe Chinese stats too?

It also allows them to show you what is going to happen while laughing the whole way.