system
Given the following post, respond as if you're commenting on Reddit:
human
Why is infrastructure spending such a contentious subject in the US?

From my understanding, infrastructure spending would improve the supply chains in the US, create jobs, reduce green house gases, along with providing many other benefits. 

President Eisenhower's interstate highway system seemed to be a success so why is there such pushback now? Wouldn't infrastructure spending be a net positive for the country?

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Thank you.
gpt
First, the economics is about tradeoffs. Resources have alternative uses, so opportunity costs matter as well as benefits. Second, everyone might value benefits and oppotunity costs differently depending on their age, economic status, ideology, personal preferences etc. Many people simply dislike paying higher taxes to finance more public spending, Also, for instance, an elderly person with no kids might not care as much as a young person about how much the potential output would increase in the long run.