The most offensive thing about it is the plot. A bunch of ordinary citizens want to establish a town in the west and live their lives in peace, but the corrupt government wants the land for a railroad so they can profit from the land. So they devise plots to steal the land from private citizens, and Sheriff Bart foils them.
If this movie were made today, it would be that the evil white landowners want to selfishly exploit the land, while the good government wants to use eminent domain to build a bullet train for the people.