Your post is insightful, but it could really do without the inflammatory death-wishing in 2a.
Multiple social issues throughout 2020 have together completely exhausted my usual compassion and optimism towards people. 300,000 Americans and 1.6 million people worldwide are dead but many millions more still don't see this as a public health emergency. Moreover, beleaguered medical workers have been harassed everywhere online and fist fights and other assaults have been reported across the country that were started by wearing a mask. And then there's the cyclopsian intersection in the venn diagram of "people who are aggressively anti-mask" and "people who are unconcerned with or even violently opposed to the health and safety of anybody outside their tribe".
From an entirely pragmatic standpoint, the freedom to choose one's own destiny is arguably the most important human right. All of the information necessary to protect yourself and those around you from this disease is now widely available. Most people who wish to minimize their risk of exposure can do so, with the notable exception of the many medical workers who have been, not asked, but demanded, to put themselves at risk in the service of people who believe those same medical workers are part of some vast conspiracy.
So, I'm asking honestly here, to you or whoever else: convince me to care about the plight of terrible people.
2. It's really curious to see people saying, on the one hand, that they're uncertain about a vaccine because of some unexpected long-term impacts, and then saying on the other hand that they're unconcerned about unexpected long-term impacts from a brand new and as-yet-poorly-understood disease. There are still a lot of question marks about covid-19 and researchers are still discovering far more "quiet" impacts in apparently healthy individuals, including blood clots and pericarditis.
2a. Overall though I'm in favor of anybody avoiding this vaccine that wishes to. The disease would continue to disproportionately affect the populations of people who believe it's a hoax, or believe it's not a serious health risk, or believe it's a conspiracy, or believe the vaccine is a conspiracy, or believe that vaccines in general are conspiracies -- and we could do with fewer of those people.
3. As two other people have already pointed out, the researchers have only been cautious about not stating something that they don't know to be factual. It's funny: when researchers are cautious, people read too much into it and draw bad conclusions, and that leads to the kinds of research press releases that other people then criticize for making statements unsupported by evidence. Researchers have repeatedly stated in various media that there's no reason for them to expect people to be infectious after taking the vaccine, they merely haven't tested for this specifically.
4. The people they're talking about here are the sort that need to carry an epi-pen with them wherever they go. If you are one of those people, then yes, at this time there's an uncertain amount of risk associated with these vaccines. The situation is still developing and there should be better information available as the vaccines are distributed.