I don't get the logic.
If all of those people who show up less than an hour before their flights were to all suddenly show up two hours before their flights, why wouldn't the wait at the screening area be essentially the same?
While I can't speak for the Little Rock airport, I do know that it would be a waste of my time to show up at PHX T4 two hours before the last flight on WN from PHX to SNA. At no point in the past two years has it ever taken me more than 15 minutes to go from curbside drop off to bag check to the TDC and then through my pat down (I always opt out). I regularly arrive no more than 60-75 minutes before my flight and still have time to grab a soda, pop open my laptop to check mail and such and then line up for boarding.