The issue is that, by having politicians decide where and when to build the bridge, you don't necessarily end up with the right bridges. What you wrote is corr

The issue is that, by having politicians decide where and when to build the bridge, you don't necessarily end up with the right bridges. What you wrote is correct, the flaw is you put in the word 'useful'. If it were just about bridges and railways, it wouldn't be so bad. But lately economic stimulus is used as the fig leaf for all types of whole scale wealth destruction like cash for clunkers, amongst countless other examples.