The internet may have taken 30-years to reach commercial viability, but that doesn't mean it would not have happened privately. Again, as soon as people began using computers as more than simply adding machines, it was pretty clear how beneficial it would be if computers could talk to each other. Eventually, the internet would have happened. Who knows if it would look like it did today (or would be better, or worse) without government involvement. It's impossible to say. But, when stock traders, for example, are willing to invest hundreds of millions of dollars to build a fiber cable to shave 3 milliseconds off their trade times, I have no doubt they would have invested similarly to have the communication abilities afforded by the internet.
My original point was, be careful when people hold up the fruits of government investment. Government fertilizer might have had nothing to do with the size or taste of the fruit. And moreover, that fertilizer might have been much better used on some other type of fruit.