Sure, but what I'm saying is analogous to something like, "this person has fist-shaped bruises, they must have been attacked by a human or something pretending

Sure, but what I'm saying is analogous to something like, "this person has fist-shaped bruises, they must have been attacked by a human or something pretending to be a human" and you're saying "but I was under the impression that humans cause damage by killing people." The spike protein is part of the virus. The spike protein is the part of the virus that fuses the virus membrane to a cell membrane. The spike protein may cause heart damage via inflammation.