Yeah, but Helen was already in Troy. Aphrodite saved Paris for another day, but it wasn’t the first time he’d been with Helen.
Didn’t he meet her on his own somewhere else and bring her back to Troy, precipitating the whole mess?
If Paris got slain, as he should have, things could have settled down. In any event, skunks like Paris were not worth the shedding of Hector’s blood, not to mention the ruin of Troy itself. But heck, when your bio-dad is top god in the form of a swan, I guess people act differently around you.
Paris was part of a trade delegation along with Hector, his older brother. Paris met Helen in Sparta where she, as Meneleus wife, was Queen. Since they were both princes of Troy, this was an official state visit.
By supposedly “seducing” Helen and “kidnapping” her, the insult and injury was not merely a private matter but an affront against the state by agents of another state. Meneleus appeals to other Greek kings for support in expunging this stain on Greek honor and hospitality and the rest, as they say, is “history.”
(It’s history in a fairly loose sense of the word since we know something like a seige and sacking happened at Troy at about the right time period (@1400 B.C.). But we cannot determine how much the event related in the Illiad correlates with evidence on the ground. If we could just find the funeral mounds for Hector or Achilles, then things would be different...)