Obito had a pact to not destroy Konoha with Itachi right?
But then Itachi died and Obito was like "TO KONOHA WE GO!"
But in the long run Obito knew Kabuto would edo tensei Itachi. Which is why he tried to take Konoha so fast. After words he stalled Naruto and co at the Kage Summit, but had to save Sasukes ass.
Itachi > Obito
Edo Itachi > (pissed pants) Obito
Obito thought he would have T-hawk under control but he didnt and thats what caused him going to war