@Eris You dont. But you do need to understand a topic if you expect to state facts about said topic.
@Eris Thanks for proving my point, that people too stupid to pass the above test will also be too stupid to assert actual facts correctly.
@Eris I've addressed this topic in detail dozens of times on my time line. Every time the anti-vax morons just spew nonsense and ignore or arent smart enough to comprehend the reality. So yes at this point I stopped putting int he effort because its a waste of my time.
I didnt invite further discussion. Quite the opposite. The OP shows the basic level of knowledge a person needs to have before even approaching the subject, of which most anti-vaxers dont have. So it explicitly suggests people unable to pass the test DONT discuss it, the opposite of inviting it.
I'm here right now, asking you to change my view, and you keep refusing. It seems more like you prefer to debate with people who are incapable of changing their views, and already agree with you.