We are emotional beings who leverage emotion as a force. We naturally make arguments that are full of muscle, but they frequently lack coherence or effect. And so, just like a muscle needs to connect to something structural or it collapses in on itself, so too, do good arguments need to connect. They first need coherence, a connection to validated truth. Second, they need to connect to action, some real and positive effect in the world.
In other words, your argument needs a ligament.
And yes, I’m mixing metaphors. (A ligament connects bone to bone whereas a tendon is what connects muscle to bone. But the phrase, “your argument needs a tendon,” doesn’t really sound as nice.)