If you want to burn down the GOP and build a principled alternative, Trump is at best a diversion from that task. At worst he’s going to not only burn down the GOP, he’s going to finish burning down the republic.
Your worst-case scenario is such a low-probability event that it’s only worth acknowledging, but not worth using as a reason for voting against Trump.
He has built buildings and businesses for a living.
He is raising a magnificent family.
These two things alone, though far from exhaustive, are reasons why Trump will not burn down our republic, neither willingly not unwillingly.