you could be surprised as your penchent for disproving the Bible and for making statements inthe finality tend to lead you astray.
History is what it is. One can argue about human motivations but facts are facts.
Judea was an independent kingdom until 6 AD when they applied to become a Roman prefecture.
The Romans would not have wanted or needed any sort of minute contol over the kingdom as long as the tribute was paid and the peace was kept. Failure to deliver on either of those would be a cause of trouble but Herod the Great was a loyal Roman vassal, first of Julius Caesar, later of Marcus Antonius and finally of Augustus. Despite the calumnies heaped on him by Jewish sources, there is no indication that the Roman authorities were anything but satisfied with his performance as king and he was an extraordinary engineer and builder. Rome was not about upsetting the status quo within their own borders. They would have had no reason to interfere in the internal workings of Herod's kingdom.