The Empire (aka Star Wars Rebels Marketing Department) in an attempt to win the hearts and minds of the citizens of Lothal has decreed that every denizen proudly display these propaganda posters.
The missive that was handed out on the last day of SDCC 2014 demands:
Citizens of Lothal:
It is by Imperial Decree that you are requested to proudly display these posters on behalf of your Empire. As loyal residents of one of the Empire's most vital stations on the Outer Rim, your compliance is appreciated. Imperial Service is a noble endeavor which paves the way for your freedom and security.
Remember, it is the will of Emperor Palpatine to ensure the future of a stable and prosperous galaxy.