I'm not going to argue about how it's pronounced now, but the Sanskrit "ta" (?) is certainly not to be pronounced that way in traditional pronunciation. It would have to be ? or ? to be rendered as "tha" (or pronounced that way, for that matter). How modern Indian languages pronounce those graphemes is completely beyond me, however.

As for the futility of war, the Mahabharata definitely shows the negative consequences of war, but the consequences of not having gone to war would have been worse. The Pandavas' enemies would triumph and destroy them anyway.