The point is that government can use vaccines to control us and harm us.
The point is not that government is doing so.
The point is that government can do it, which is kinda scary.
Checks and balances cannot help if only few people know about the result of a certain modification.
Here in America, vaccines are rigorously tested and the government demands that doctors have a very good understanding of what any treatment does to the body and brain before approval. This is never 100%.
Its hard to test vaccines for everything. Impossible, actually.
You may, at best, know what vaccine does in obvious quick results regarding general health.
However, what vaccine does in 10 years, or what it does to your offspring, or what effects it has on mood, brain, thoughts, is something you can never know because there is no way to track such results.
So yes, the fact is that government can use vaccines to control our thoughts.
The government probably doesnt do that, but the fact that government can do it if it wants is scary.