Apparently you are forgetting the actions of the messiah, Judas of Galilee, who led a revolt against the authorities in the early first century. Judas and his forces captured the city of Sepphoris, about 3 miles from the Nazareth location. The Romans came and attacked the city burning it to the ground. A new Roman city was built there, and it became the capitol of the Galilee until the year 19 CE when the capitol was moved to the new city of Tiberius. That would explain why there was a Roman military camp at nearby Nazareth to help rebuild and defend the city of Sepphoris before Tiberius was built. When more excavating is done beneath the city of Nazareth more evidence of the Roman military camp will be found.
Sepphoris
And there were various other towns around Sepphoris which would have been equally as good of candidates for having a Roman fort at. Why go to Nazareth, which is off the beaten path, to build a fort? Strategically, it makes very little sense.
And when you are basing your opinion on just one possible (possible being a very key word here, as simply, the evidence is not stacked up to back up your statement. You have one small piece of shaky evidence that simply has not been substantiated by any real scholars) idea that really isn't being supported by anything. The sources that you've given to back up your claim are not scholarly, and as we have seen, are filled with problems.
Basically, you're making a conclusion based upon a pipe dream, and then claiming that it is fact and that in the future, it will be proven to be true. That simply doesn't work.