The people elected a governor and the legislature. Senators prior to the 17th Amendment reflected the political make-up of those political entities.
For example, right now, the state of Arizona, where I live, has a Republican majority legislature and a Democrat governor. We just elected a second Democrat senator. Now, if the 17th Amendment didn't exist, the governor would select the senator, and the legislature would have to confirm the choice. The likelihood would be we'd have 1 Democrat (already serving) and 1 Republican senator since the majority legislature would likely not confirm a second Democrat. The governor would have to compromise.
That is was the whole idea of how the Senate would work prior to the 17th Amendment. It would move towards moderation and compromise rather than extremes based on popular voting. You simply cannot grasp this.