I HATE TIA!!!!!
she has an excuse for Queen Chrysalis, since she was trapped.
They needed elements of harmony to defeat Discord. How would they protect Canterlot from him? And if Canterlot fell it would have still meant nothing to Equestria. Because Discord had the elements and was already terrorizing local population.
Both of whom were all but useless as the Royal captain of the guard was beaten as if he was a colt and the princes of love was turned into giant battery for the shield. And if Celestia had not tought her student the black magic then so would the elements of harmony. Oh wait. There were no elements of harmony in there, just a couple of representing ponies with no abilities to defend themselves. Way to go Tia.
Considering it took both her and Luna to defeat him last time, I think that pinching in by perhaps sending Luna to at least occupy the good king would have been the least she could do.
No. No she will not.
Everypony in this town is crazy."