Edit: Sorry, I liked to the wrong article! Again, I'm not saying you shouldn't eat kale - just that it's not justified or even scientifically correct to eat it raw! Here's the article I wanted to link to: http://commonhealth.wbur.org/2014/01/the-dark-side-of-kale-a...
The endocrinologist answering questions says Basically the goitrogens are challenges to the thyroid. But in the absence of iodine deficiency, substantial or prolonged ingestion of dietary goitrogens and lastly the absence of an underlying thyroid disorder, the risk in this country of having problems in this area are very, very low, almost minuscule. Again, that’s because the vast majority of people have adequate iodine levels to counteract the effect of goitrogens.
So modest consumption doesn't seem like it is going to bother healthy people any.
Did you actually read that article? Especially the last section, which contains this actually good advice:
But when you see an article that demonizes a food, think about whether or not there are citations and follow those citations. Ask yourself whether they apply to human beings eating a diverse diet with adequete [sic] calories. Or whether they involve very high concentrations no human being eats, isolated chemicals, or preparations that no normal human would put on their plate.
EDIT: Now that you've added an article, I recommend you read the first as preparation for reading the second with an appropriately critical mind.
Different animals have different metabolisms.