I can explain it in one word. Apathy. everyone knows it does nothing and makes no sense but everyone just goes along with it.
If one state doesn't do it and it all fine then the rest should just follow along.
Now if someone wants to play games with clocks and people then cities should mandate that business stagger their hours of operation. This would almost eliminate traffic jams in big cities. And no need to build more freeways. It will save gas.
Come up with a way so companies start at 6 am and close by 2pm, then those people can hit the roads at 2PM, then another group from 7-3, all the way to people working 12N - 8pm. That way I think there would be no traffic snarls.
Why not. I'm not saying everyone, but does it make sense that 90% of a city heads home at 5PM and people sit in traffic till 7-8pm.
A lot better option than moving a clock back and forth by an hour, what does that accomplish? We're not reading by candle light any more.