Okay, here you are showing that you don't know anything about missiles, and you've likely never seen one fired either in person or in video.
Missiles squirm. They don't always fly straight, and it is a characteristic of their design.
The cruder the missile is, the more likely it is to squirm around. The more advanced designs have a position predicting algorithm and don't have to rely so heavily on tracking where the target was when they last sent a correction to the control fins, or other steering system.
Watch this video of these Iron Dome missiles in action. It's not the wind blowing their smoke path, their positions and orientations actually squirm around.
https://www.youtube.com/watch?v=UC_kGP9r78U
The cruder the missile is, the more likely it is to squirm around.
And the less likely it is to hit its target. It doesn't make sense to cart a crude, unreliable missile all the way across the Atlantic.