The US recently rolled out a childhood investment account that offered to pump a thousand dollars per child into the main market index funds backed by the US government. In the SOTU there was also a mention of matching the first thousand dollar invested in an approved retirement account for all residents - not just federal employees.

The US government is pumping the stock market with debt - as long as nobody starts dumping bonds or currency this is an action that will make number go up.

Confidence that in the short term nothing will change. All large-scale change is hard. Change that impacts everyone's workflow will be resisted even if the new thing is better, and in many areas the alternatives are pretty mediocre. Also a combination of political and economic pressure has in the past been successful in making meaningful initiatives fail or roll them back.

In the long term this is an issue. But I'm not sure the US stock market actually cares that much about what the world will look like in 4 or 8 years.

Because the market does not reflect reality.

They have been, if you compare them to the performance of the non-US market, and most software companies are declining daily.

average trader probably doesn't realise the bigger picture

yet

Voting with your wallet doesn’t work when the corpo is big enough to buy everyone off.

IGV down 18%. Tech stocks are falling

See Also: Isaac Newton...

What are you talking about? There's been a ~18% drop in tech sector this past month (see: IGV)

I don't know if it's due to "decoupling" but there has been some selling recently.