Why is setting a tesla alight domestic terrorism, but shooting up a school not?

Serious question. Is it because a school shooting does not have a political agenda? What about Jan 6th? Is it not terrorism because the goal was to overthrow the electoral process by force and not to simply strike fear in a population?

I have no problem with calling a person who bombs a tesla dealer a domestic terrorist, so long as the Jan 6th folks be labeled as insurrectionists.