“Seem to remember something about people warning that spike proteins could cause rapid-onset cancer...”
And many (most?) of those people’s warnings were ignored and their research was dismissed as being a conspiracy theory or having already been “debunked” by the CDC and other public health officials.
Those that continue to ignore the fact that the vaccines have caused a lot of harm, especially to young men, are working to prevent parents from being aware and warned about the dangers of the vaccine to children. I’m not sure how they live with themselves knowing they are putting innocent children in harm’s way.
I wouldn’t suspect the spike proteins themselves as causing the cancers but rather the MRNA vax instruction set that directed the body to make the spike proteins might have caused issues in the cells in the formations of these cancers.