instead of using "it's obvious" in any serious argument, be a good person.
there is absolutely not a wealth of resources for every single topic. and not everyone learns from the same phrasings or has the means/time to read/watch for hours on end. ignorance is not some dastardly moral failing.
ignorance doesn't excuse harm, but expecting nobody to ever be having wrong thoughts or lack knowledge or struggle with some sources is a harm unto itself