The Republic seems to spend a lot of time fixing planets that the Sith have Destroyed, remember Telos IV from Kotor2, although Taris isn't that bad. Mind you, the Sith need to learn that you get more out of terrorising a planet than wrecking it, after all they're supposed to run an EMPIRE not a graveyard.
PS. why do the planets destroyed all start with T?
All i gotta say is Alderaan, Malachor V, Katarr, and Nathema