My point is: Conversion from one idea to another is a slow process, the west didn't suddenly jump into liberalism. So, seeing that it only takes 30 years for a large number of people to shift from radical islam to militant liberalism makes me wonder!...
It is strange isn't it. A few cursory ideas in no specific order:
One possibility is that such accelerated liberalization is for that reason more superficial than the slow, deep, almost organic growth the counter-tradition has had in the West. In other words, maybe Bhutan (for instance) only has skin cancer, while America is terminal.
A second possibility is that time, understood as the succession of mental developments, is itself accelerating. So the decadence that formerly accreted over generations can now make similar progress in a matter of years.
A third possibility, indeed a likelihood, is that the liberals have more practice now. The technique of cultural revolution, in particular of propaganda, has been refined and habitualized over time, has had government money and scientific research poured into it, and as a result, has become much more effective and much more acute.
As for the fourth possibility, it's drawn from the realm of the occult. There are demonic entities known as egregores
which are created and nourished by human energies. They are distinguished from the true demonic hierarchies in that their existence is mental rather than spiritual. An egregore is like a delusion that's somehow become real; a powerful egregore such as liberalism is a mass delusion. The more people enslaved to it, the more mental energy it feeds on, and the stronger and more real it becomes.