The spike proteins come from an excess production of spike proteins by -some- of the vaccines, mainly the ones that use a modified adenovirus to cause infected cells to pump out more spike proteins that the wall of the infected cell can hold. The mRNA vaccines have a limited number of mRNA capsules that are absorbed by a limited number of cells. The overproduction problem doesn't seem to affect those nearly as much as the J&J vaccine for example.
BTW, if the spike proteins from vaccines like to attach to blood vessels in some people, what do you think the actual virus (covered with spike proteins) does?
The main issue with the vaccines is that the risk from the disease is so low in those under 30 (and even more so for children) that it's hard to justify the vaccine risk vs. the disease risk for those groups.
But the anti vaxx BS should stop. It's just counter-hype to the hype about the disease.
Even the ADE claims are bullcrap-- without the vaccines, people develop immunity or partial immunity. In reaction to this, the virus mutates quickly to find a new transmission path. That's what coronaviruses do, and they are really good at it. Which is why we have new flu vaccines that are only partially effective every year.
Here's what's going to happen. The virus will mutate. Eventually virtually every living human being will get it. Those with the right immune system or some vaccine protection will shrug it off. Those who are truly vulnerable will die off. The virus will probably mutate to become less virulent (really sick people and the dead are not good transmitters). That's it.
More Americans have been killed by the Covid vaccine in 8 months than by the Taliban over 20 years.
Pandemics are nature's way of thinning the herd, in other words.