Because evil is more highly organized than ever before, and it can offer hundred of millions of people rewards for their obedient insanity. So they accept it for the immediate pleasures it offers them, while it destroys them from within and uses them to tear down civilization at the same time.
[2 Thessalonians 2:9-12] "The coming of the lawless one is by the activity of Satan with all power and false signs and wonders, and with all wicked deception for those who are perishing, because they refused to love the truth and so be saved. Therefore God sends them a strong delusion, so that they may believe what is false, in order that all may be condemned who did not believe the truth but had pleasure in unrighteousness."
But don't worry, it's just a fence-clearing process.
Chaff.
Wheat.
There is simply no other way to explain all this. Otherwise intelligent people are so totally unable to distinguish right from wrong and good from evil. Seriously, I look at people and my mind staggers at how they have become deluded into thinking such things as homosexuality, abortion and all sorts of left-wing schemes are to be cheered and supported.
How else do you explain a once god-fearing, conservative American society that is now nearly totally incapable of making any moral distinction whatsoever?