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Not to ask a stupid question, but why didn’t the planners use destroyers to take out the pillboxes with close range direct 5” fire BEFORE the Higgins boats rolled in and dropped ramp?  Use those same destroyers to constantly fire suppressive 40mm and 20mm over the heads of the landing troops.

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Were the Germans who were captured in Normandy immediately summarily executed by the French?

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I believe most that were captured by the allies were either shipped back to England or out to work helping the Allies.

My grandpa had a few German POWS working for him in the fall of 1945.  They loved working for him as they were treated and fed better than in their army units.

My guess if the French got there hands on some hardened nazis the perhaps justice was sought.  Conscript soldiers that were kids, farmers,  and likely even prisoners from the eastern front emeere probably handled as POWS.

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Conscript gets a bolt gun, he is mostly a bullet sponge

MG-42 goes to the veterans

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This.  The bunker in Saving Private Ryan was more like an Artillery OP.

They were called "shnabelstand"" and they were not designed for MG positions.  In real life sooner or later someone would start pumping rifle fire into the aperture and that would be that.  Which didn't happen in the movie because Spielberg told the actors not to.

https://www.bunkerpictures.nl/pictures/france/seine-maritime/etretat/Schnabelstand-2.JPG

Many bunkers looked like this.

https://www.battleofnormandytours.com/uploads/2/5/1/7/2517577/6397907_orig.jpg

Notice there is a wall on the sea ward side, not the landward side, to protect it from fire and observation from ships, and its sector of fire was down the long axis of the beach.

You can see that the wall is parallel to the line where the water meets the land, and the ships and aperture cant see each other, due to the wall.

Sectors of fire looked like this:

https://scontent.ftpa1-1.fna.fbcdn.net/v/t1.6435-9/48369007_731775890513355_3554380840995651584_n.jpg?_nc_cat=109&ccb=1-3&_nc_sid=9267fe&_nc_ohc=fqAZnmVN5ZAAX9hckG0&_nc_ht=scontent.ftpa1-1.fna&oh=70b7e781d33c3ede7fb69760a550b6c7&oe=60D29ECC

Without getting into the weeds, moving off the beach and engaging the enemy to the flank like that is super hard.  If you cant lay down enough suppressive fire, which you cant, you really need night, or in this case, a lot of smoke.  Or maybe if the bombers hit the dust would have obscured that MG42 position so he was blind.  As it was, he had a great sector of fire.  This one did a lot of damage to A Co, 116th infantry. If you look in the distance where there are six people standing around, that's where A/116 landed in the first wave.  That was far enough away that it would be hard to shoot into the bunker aperture, but close enough that the bunker could do a great deal of damage.  The sector of fire looked like a kilometer, at least.  

The Germans were pros and set up these sorts of flanking enfilade positions all the time.

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What would keep a conscript from turning an MG-42 on his own barracks?

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Have you ever been to Nebraska?

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The other beaches weren’t as well defended as Omaha.

The Americans were told that they would be facing 2nd rate troops at Omaha  including old men and boys when in reality what they came up against was the German 352 Inf. Division that were in Normandy for rest and refitting.

About half of the 352nd were battle hardened vets of the eastern front and dug in with good positions, bunkers, mines covering the beach, interlocking fields of fire with good views from the bluffs and steep terrain they simply mowed down everything coming at them until they were flanked and overwhelmed.

It could have been MUCH worse.