I know that it is the common vernacular, but you didn't let them go, you fired them. Surely they would prefer to not go and continue to pay their mortgage. I'm sure it wasn't easy to fire them, but don't try and make the situation rosey. The folks who decided on the direction of the company decided wrong and now they have to fire the people who executed those decision. Edit: Would you all prefer the word "Terminated"…
"Fired" implies wrong-doing on their part.
"Laid off" or "let them go" means the company couldn't afford to pay them, or didn't need them anymore. It leaves no black mark against their name.