Why is developing a vaccine for the covid19 so hard?

Question

To the best of my knowledge, vaccines are made out of 'dead' viruses to 'train' the body's immune system to fight the real deal when the time comes.If so, why is coming up with a vaccine for the covid19 is hard? I read that this is due to the lack of understanding of the virus, but would it matter if all we have to do is to make a soup out its dead corpse?

sushshshsh · Accepted Answer

The process of developing, testing and licensing a vaccine for widespread population use is designed to be slow, deliberative, peer-reviewed, reflective, evidence-based, so that we don't make mistakes," Poland said.
Going too fast could lead to a vaccine that's not effective or, worse, can cause serious health problems, Poland said.
Seems like the answer is bureaucracy and also an abundance of caution

croes · Answer

https://www.latimes.com/science/story/2020-03-12/why-does-it...