Why does the Bt toxin not kill the bacterium that produces it but kills the insect that ingests it?

Why does the Bt toxin not kill the bacterium that produces it but kills the insect that ingest it?

Why does Bt toxin cannot kill the bacterium that produces it, but kills the insect that ingests it?

why does Bt toxin not kill the Bacillus?

Bt toxin kills the insect by

Bt toxin kills the insect by

Bt toxin kills insects by

Bt toxin kills insects by

in case of Bt cotton, how does the toxic insecticide protein produced by the bacterium kills the insect pest but not the cell of Bacillus thuringiensis where the toxic protein is generated?

In case of Bt cotton how does the toxic insecticide protein produced by bacterium kill the insect pest but not the cell Bacillus thuringiensis where the toxic protein is generated?