You shouldn't be. You probably do it to. :)
Specifically I'm referring to my spouting off of seemingly educated information. Now, I certainly never misinform intentionally, but when it comes to something I'm passionate about I can tend to let my mouth get ahead of me by repeating things I've "heard" but don't necessarily know to be true.
My case in point: recently I told a good friend that "the worldwide average weaning age is 4 years old". If you read that, you may think it partially believable. After all, there are a TON of indigenous people groups who nurse children for quite a while. But stop and think for a moment what the word "average" means. This word imposes the assumption that there are an equal number of children weaned prior to four years as there are weaned after four years. Not only that, but it assumes that for every child weaned at 2, there is a child weaned at 6 - that 4-years is the "average" - the sum of ages divided by the quantity of babes.
After looking into this, (first, here in a post by breastfeeding blogger "the lactivist)" not only did I begin to find the "statistic" absurd, I also found educated breastfeeding proponents questioning its validity and source. Anthropologist Kathryne Dettwyler states the following in her paper titled "A Natural Age of Weaning"