[Macbeth] In Act 2, Scene 3, lines 85-90: How is the theme of guilt refined in these lines?

I hope our line numbers match: they don't always do.

His silver skin lac’d with his golden blood,

And his gash’d stabs look’d like a breach in nature

For ruin’s wasteful entrance; there, the murderers,

Steep’d in the colors of their trade, their daggers

Unmannerly breech’d with gore. Who could refrain,

That had a heart to love, and in that heart

Courage to make ’s love known?

This isn't so much guilt as Macbeth trying to cover up his murder. He claims he could not stand to see the guards with Duncan's blood on them. He really didn't want the guards to talk and proclaim their innocence.