This often gets raised in the context of political retribution when the more obvious concern is civil society, protest groups, abortion providers, trans care providers, anyone "harboring" undocumented people. If you want to know how Trump will use DoJ just look to Ken Paxton in TX.
"This means that if Trump returns to office, he will have free rein to wield the Justice Department as he sees fit—and he and his allies have already given plenty of indications as to what they plan to do."
Alito and Thomas serve a very useful function in drawing attention away from Roberts.