Fallout – ny way to give Boxcars 15 Med-X

Some of the crafted ammo is substantially better than anything you can buy. Examples include Max Charge ammo for energy weapons, which deal 75% more damage, and the various Hand-Load ammunition, which often negates armor or has extremely large damage bonuses. You can see all of the crafted ammo that's better than what you can buy here.

Additionally, if you're playing on hardcore mode, ammo components (lead, powder, primers, cases, spent energy cells, etc.) have no weight, but actual Ammunition does. Especially with Energy Weapons an Veronica as a companion, you can substantially cut down on your carry weight by crafting ammo on an as-needed basis.

You could maybe argue that the Followers of the Apocalypse are "Good Guys", but even they refuse to offer assistance to the Strip without some coercion.

As far as the four primary plot paths go though, no, there's no black and white to be had. All four players have redeeming qualities, and they've all done (varying amounts of) extremely questionable, if not outright irredeemable stuff.

In general, the moral choices in FO:NV are not about good or evil. They're about priorities and willingness to pay various prices - which makes for a much more interesting moral landscape.