The real harm of cars is in how they forced cities to spread out, putting miles of asphalty moonscape between every destination, forcing people to spend thousands of dollars a year on vehicles that they shouldn't need, driving greenfill development that doesn't raise enough revenue to support itself, forcing cities to develop ever more automobile suburbs for the immediate revenue to fulfil their maintenance obligations on the old ones, going into massive debt to keep up appearances on what is effectively a ponzi scheme, not to mention the human cost of traffic violence.
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Decentralization is not an advantage for currency and contracts. The problems that decentralization "solves" were never problems in the first place.
Nobody was asking for a new way to store their money that doesn't have any identity verification besides a single digital key, which doesn't have the ability to dispute or undo transactions, and which takes multiple minutes to clear transactions.
To quote Kai Stinchcombe
> There is no single person in existence who had a problem they wanted to solve, discovered that an available blockchain solution was the best way to solve that problem, and therefore became a blockchain enthusiast. ...
> Nobody went out and did a survey about whether most credit card users would be willing to give up their frequent flyer miles in return for also losing the ability to dispute a transaction.
