True, look at how pundits point out how far the rim of the Galaxy is from Earth and then point at the SS Valiant being "Swept past the edge of the Galaxy".
Er, in the 3D universe we live in, it only had to be swept a short distance up or down at right angles to the Galaxy's gravitaional plane to be swept out of the Galaxy.
The Galaxy is not flat!!
I have a friend who was bounced all over the world, as a kid, as his parents travelled a lot for work.
Kirk's father had some connection with Captain Garrovick, as Kirk mentions that Garrovich helped him into the Academy and influenced him.
If you piece together all the snippets of info given in TOS about Kirk's previous life, it is quite complex, full of tradegy and lucky escapes.
Kirk is a very driven and troubled individual.