The force between contacting molecules in matter is electromagnetic (negative electrons electrostatically repelling each other when they get closer to each other than to their positive nuclei).

A trapped electron will impede the flow of other electrons through the circuit because electrons repel one another.

Consequently, this electron will repel other electrons creating a small region around itself in which there are fewer electrons.

Electrons should be attracted to protons in the nucleus, but electrons also repel each other.

The electrons in the d-orbitals and those in the ligand repel each other due to repulsion between like charges.

Because the electrons strongly repel each other, the effective charge description is very approximate; the effective charge Z doesn't usually come out to be an integer.

Now protons and electrons repel one another strongly, so they cannot form a macroscopic phase of protons or electrons.

It explicitly ignores the mathematical equations that show that electrons repel each other ("electron-electron repulsion terms").

Why do these electrons not repel one another by Coulombs Law, and the whole wire explode?

I would expect the bonds to be longer because there are more electrons and the electrons would repel each other more.