On a multi-lane highway, do you feel the cars in the left lane should move to the right if someone is behind them looking to pass, or should they stay and go whatever speed they'd like?

I take a commuter highway to work every day, and there are several Facebook groups about it, indicating road conditions, issues, and often complaining about other drivers.

The speed limit on the highway is 65.

Often, people are complaining about cars in the left lane who refuse to move over if people behind them are looking to pass (looking to go faster). When the slow cars refuse to move, traffic gets backed up due to the other two lanes moving slowly, and so people get stuck behind the slow guy in the left lane.

What is your opinion on this? Should the slow people in the left lane move over or should they remain and go the speed they’d like?