I have no problem with this. Religious stories are parables. They're not at any point intended to be interpreted litterally.
You're the one reading this as a fundamentalist, more extreme than any religious person would
You and I didn't attend the same church, obviously. You're not an American, so I can understand. I can assure you, there is a wide swath of Americans who take this story--and every other story in the Bible--literally. They believe, without a shred of doubt, that three "Wise Men" somewhere in the East saw something in the sky, knew exactly what it meant, mounted up their camels, and walked as fast as they could, first to Jerusalem, then to Bethlehem, where the star stopped over the exact house where J, M, and JC lived.
To suggest otherwise--it's just a fable, a metaphor, mere legend-making--is to suggest that Bible is not trustworthy and that God does not exist, and we can't have that, can we?
I know such people exist because I was raised by two of them, attended church and school with a large number of them, and was in fact one of them until my early-thirties. So when ex-creationist goes to the trouble of illustrating what this story "might" have looked like, I may have assumed my default position was in play.
Perhaps Matthew was merely tossing signs into the sky in order to bolster his claim that here was born the King of the Jews. But it doesn't read like that. I agree with you that there are often descriptions of heavenly events coinciding with the birth of great personages. But do any of these other tales involve the heavenly sign leading people around like a GPS app?