It's not about spine, it's about the system. There is currently no mechanism to change this, even if we wanted to, which we generally do. We have to change the system first, so that a change in how we handle Sociopathic Oligarchs is possible.
And frankly, we're working hard on that. We've got a Midterm Election coming up that Dems have been working very hard to exploit as much as possible (for a change), and more than that, the people who are running and winning primaries are the kind that are going to insist on substantial changes when they get in office, starting with leadership. If the Dems take the Senate, Schmuck is out as leader, and then out of his office in 2028.
When we change the profile of the party, take control of Congress, then change the leadership, we are on the path to make bigger changes that can have a real impact.