Good question and largely why 'conspiracy' theories run rampant. They aren't been forthright with us and yet wonder why people become skeptical.
It's like the sudden interest in providing millions of people with the Antigen Tests. What that will do in vastly increase the number of positives in the community, even with asymptomatic people and boost the nightly 'Postive Case' numbers. That will encourage us to comply with the upcoming Lockdowns.
Wonder why the modeling says we will have over 10,000 cases a day...that's why.
That's called social engineering and it works on a gullible society.