Things have gotten better and progress has been made from times past, it just seems worse now because we have more access to information. We've come far, and have further to go!
The problem is that the line between “we’ve come a long way” and it’s corollary “therefore why are you upset/why do we have to address [insert issue]?” is razor thin.
Celebrating success is great. Using it as a cudgel to stop further success is not.
The real problem with ignoring progress we’ve made is that it gives the false impression that what we’re doing is worthless, leading to demands to tear down everything we’re doing.
People are constantly clamoring to replace our systems with new ones “that actually work”. This is a result of being blind to the ways our current system works.