I don't believe it's an inability to express themselves well, I believe it's a vapid, low-quality way of thinking, held back by an inability to form a thought inside your own head that you yourself can actually understand.
Exactly.
Someone described words as “thought capsules”. Without good words, or words well-defined, one’s very thoughts are limited. This is why language has come to be recognized as a socio-political battlefield - by the progressive-left, anyway. We on the conservative-right seem instead to cede most every linguistic battle without a fight. Then we marvel at the fact that Americans can’t think rationally, and instead fall victim to soundbite-itis and “blurry” speech.
Orwell warned us of the power of language and of its use, in the wrong hands, as a weapon of tyrants.