s04e10 — One of Us

For the past couple of seasons, I have been tormented by one question, why can't they use the tool that "kills" Isabelle at all? Why should Isabelle now regain her strength, when now it is possible to develop a remedy based on her allergy that will make all mankind suffer from an allergy to melatonin and not become those very special people at all? Why was it necessary to give such a tool into the hands of mankind? (It's not clear what the plot is). But logically, why doesn't her allergy develop further?

And I was so hoping that in the last episode, Richard and Isabelle's line ended on a good note.

Well, if these assholes take over the world, then this whole Tom fight was pointless. They told Tom, "Kill Isabel." No. I decided that it is not necessary to kill))) Prick

Oh no, people in the present are completely powerless, like puppets.
First kill Isabelle, then return the abilities