I hear you. But this has a different quality. In the '60s and '70s, people were critical, and for good reasons. The MAGA crowd is simply partisan. They don't care if the system is corrupt, they will use and praise it, when it's for them and demonize it when it's against them.
Speaking of corrupt, the left has also good reason, actual good reason, to be critical of the judicial system. The current SCOTUS is a disgrace.
But an overall acceptance of the rule of law is what holds a society together. And while the '60s were critical of some institutions, there was still the overall acceptance. I see that slipping today.
Another key difference back in those days was that the public dialog was raw, but honest ("telling it like it is" as they used to say). People were inclined to question authority, not uncritically accept it at face value. There wasn't always widespread acceptance of the rule of law, as there was a good deal of civil disobedience (and some not so civil). And in some cases, there was outright defiance and disrespect for the law, as this period was also the heyday of the Mob and organized crime. The government itself also appeared to operate as if they were above the law, so there was a great deal of passive resistance, particularly among the younger crowd, among whom the police and political establishment were commonly referred to as "the pigs."
Even prior to that, there has always been a certain sub-culture and undercurrent of opinion which has always been a bit anti-government. Not necessarily revolutionary, but more just people who would rather be left alone. Somewhat like the moonshiners and their attitude towards revenuers. Or even among kids who like to do things which they might see as victimless crimes, but crimes nonetheless, which automatically puts them at odds with law enforcement and the rule of law.
Tracing back the political etymology of the MAGAs, one can discern many of the same ideas back in the old days as well. Of course, they're partisan, but it's oftentimes rooted in certain myths about Americana and nostalgia about the good old days. Their America First position seems atavistic, but simple.
In contrast, the Democrats (not to be confused with "the left," though there is some overlap) have become a bit muddled and mushy. Public perceptions of the "rule of law" are also being called into question. It reminds me of Billy Jack's line: "When policemen break the law, then there is no law. Just a fight for survival."
Of course, realistically, those who have the most firepower and the most troops on their side would win in that fight, so that's what people are inclined to obey, even if they neither know nor care what the law actually is. It seems it's usually the military that provides the tipping point between democracy and dictatorship.