No, government can only pass laws protecting individual rights. You are talking about "public relations".
Postal System? Probably an internal mechanism of government as it exercised its just powers. Elements of government must communicate among themselves and with the citizenry.
No, government can only pass laws protecting individual rights. The governments internal mechanism does not protect individual rights.
Scientific Research? Depends on the project. Some might be justified under research for military purposes. Protection of property rights could be cited for things like pesticides. Protection of life for medical research.
No, government can only pass laws protecting individual rights. You state military advancement and property rights.
Interstate Highway? Was justified by Eisenhower for efficient military movement and civilian evacuation should we be attacked.
No, government can only pass laws protecting individual rights. Public goals such as mass evacuation is not a protection of individual rights.
See how difficult it is to realistically deal with any legislative question with the phrase:
No, government can only pass laws protecting individual rights.
No, government can only pass laws protecting individual rights. You state military advancement ...
I stated that our government is exercising a just power ceded it by its citizens to secure their individual rights to life and property from foreign invasion. The purpose of the army is to protect each of our individual rights. In order to secure those rights, the army must be prepared to repel an invasion. To repel an invasion, they must have weapons capable of doing so. How effective do you imagine our army would be repelling an invader today using musket and ball? About as effective as the Iraqi army was stopping us? Probably less so. How is the army supposed to move from a musket and ball capability to one capable of defending our rights today? One way is to devise new weapons. One part of devising new weapons is to "research" them. There is nothing specifying how the government exercising its justly ceded power to accomplish that research. Empowering means they decide how.
If you can't make the connection between military research and the ability of the army to protect our rights, I have nothing left to discuss with you.