Need clarification:

Q says vaccines are bad, but not all of them. Some Anons here area dead set against vaccines on the whole.

However, preventable diseases are now breaking out seemingly regularly. Many reputable medical professionals are attributing this to unvaccinated illegals pouring into the country and mixing with unvaccinated citizen populations (anti-vaxxers).

Still others would argue even some vaccinated people are symptomatic suggesting vaccines may not be working in some cases. This strengthens the anti-vaxxer arguments to a degree but doesn't explain why smallpox and polio are largely eradicated.

What gives? I'm legit confused by this conflicting evidence.