The first assertion is not true, and in fact the second assertion is the reason. Entrepreneurs are incentivized, but it is an incentive to get rich quick. If I as a VC can make 10x my investment in 2 years by investing in a 'Hot or Not' web app, I'll do that rather than invest in a fundamental technology that produces a 10x return in 15 years. The market is very focused on web apps now because there are great opportunities for viral growth at the expense of existing businesses. This is cannibalization, not real wealth creation. We should really stop referring to web businesses as tech companies: few of them produce any more real technology than your average McDonalds.
Government plays a valuable role precisely because it invests in technologies that are unlikely to produce a return but nonetheless could provide the basis for new businesses that can in the future. The Internet itself is a good example.