Why haven’t they charged the parents of Thomas Crook with involuntary manslaughter for the murder of Corey Comperatore at Butler Pennsylvania?

[WVU82]

They charged and CONVICTED the Michigan parents for the crime of their son in the Michigan school shooting.

They charged the Georgia father for the crime of his son in the Georgia school shooting.

Why haven’t Crook’s parents been charged for the murder at Butler Pennsylvania?

Are there details they don’t want coming to light at a trial?