Things are constantly changing, if they did not we would still have slavery...
In order for things to change for the better, people have to constantly participate to make changes to the system that benefit the majority of the population, so we don't have to have violence/rioting.
The USA has had regressive changes for the last 40-50 years because people became complacent, people at the bottom have reached a breaking point, we will see if this breaking point will bring progressive changes, only time will tell.