You almost make it sound like it ever had.
There have always been and there still are broadly shared abstract ideals, and there have always been wildly diverse opinions how to achieve them.
As far as I know the most foundational moral ideal has always been the freedom to individually pursue happiness. Actually, it seems to be you who is abandoning this moral ideal.
I'm actually for a government who tends towards a more libertarian view of things, because I believe individuals pursuing their own purposes is so incredibly important - being inclusive of a variety of beliefs should be the foundational goal of government. However, I think what you can often see is that government power can afford to be weaker, when their are common moral ideals that the vast majority hold to. In other words, when there is a implicit cultural agreement to do things in a certain way, you don't need strong coercive regulations and a bigger more forceful government to do those things in place of culture. With less cultural agreement then, you have two or more competing sides trying to enforce their vision of what society should be through laws. This is what seems to be happening right now, because so many people no longer think their is enough common moral ground to convince people through argument, so the hammer of the law becomes the preferred tool of choice.
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