I actually agree with you on the Constitutionality aspect, but history has proven repeatedly that the current approach to funding of research is NECESSARY for national survival, both military and economic. A "pure market" approach simply doesn't work as well.
And most of the abuses are the result of "avoiding competition" (crony capitalism or a monopoly on control of funding).
Therefore you are an anti-constitutionalist. I do not see these science lobbies offering science amendments to the constitution.