By that standard every Star Trek movie needs to be seven hours long and every episode three. I'm just wondering when some Star Trek fans started needing everything spoon fed to them? Because once you get back to Earth, you actually have other factors to deal with like the Earth government, the media and so on. By destroying the Enterprise before she ever makes it to Earth, he can control the flow of information. He was going to destroy them near the Neutral Zone, but they took off before that could happen.