In my opinion - JW's are " ignorant " in the sense that the WT Society and WT indoctrination KEEPS them ignorant. Their world view is very skewed to the point that anything that they consider important is ALWAYS WT Society or JW related. Anything outside WT cult indoctrination is looked down on.
By WT leaders insisting that they only read WT literature or the JW website to gain information- most of what JW's view as " real " or " normal " is actually - totally abnormal. Unless a JW somehow escapes to get a college education or does research outside the JW or WT mindset - they will remain ignorant and have a tunnel vision of what reality is.
I don't totally blame JW's - they're controlled and indoctrinated to think that way. Somewhat like victims of the Stockholm Syndrome being forced to identify with their captors - WT Society leaders. Sometimes it takes suffering an injustice by WT elders or getting treated like crap by fellow JW's to shake a JW up into truly thinking again with their brain. And if that happens- then they can gain critical thinking AND intelligence - and know true freedom of mind again