They should, but they don't. They know that and you know that. Knowing that, it's irresponsible to publish headlines that are misleading when taken in isolation.
In reading some of the other articles from the source link, the site makes some fairly large claims based on thin evidence and appears pretty anti American and pro Russian propaganda. I'm not sure the sure can claim to not be guilty of the very same thing it is claiming others are guilty of.
They made reasonable editorial decisions that you and thegrayzone.com disagree with, that's all. They weren't irresponsible nor were they misleading.