it's a statement of opinion- "It seems, to me"
Happy to explore this with you further.
What exactly is the mental illness?
How is it being identified, how is it being measured?
I'm against vaccines, as you presumed, as I've personally seen resulting correlations to increased occurrence of Autism, and [lesser] conditions of peanut allergies and gluten intolerance.
There may be elements in vaccines become unintentional casualty to the body being trained to reject what we are intending for it so classify as foreign, to fight. There's observable overall increases in these conditions from those who've been vaccinated.
We haven't been able to isolate for these yet. I believe we haven't investigated enough. Or perhaps they're not related... but it's my hypothesis.
We don't have ENOUGH information to draw conclusions for MANY things, these observations are merely mine and are thus my opinions.
I recommend everyone does their own research and make their own decisions.