When it comes to GA I believe GA should receive some benefit for the duty paid on fuel.
Definitely.
Over here, the FAA is funded 77% by the Aviation Trust Fund and 23% by the General Fund.
The Aviation Trust Fund comes from aviation taxes on fuel, tickets, and packages sent by the air.
The General Fund is an enormous pool of tax money that funds a wide range of government services, like transportation, that are important for the public good.