kzt wrote:n7axw wrote:He might have had to wait a few weeks, But there was really nothing to distinguish him or his people from everyone else. There would have been nothing to suspect had they showed up at the space port and played tourist.
To misquote Benjamin Franklin, three can keep a secret if all three are dead. He felt the deniability was essential. And felt it so strongly he was willing to die to ensure it.
Pushing the button was necessary. It destroyed all the installations that had evidence, including, I presume, his private yacht, the Prometheus (which had a streak drive). The previous raft of explosions took care of the people they couldn't get off planet (and, presumably, some of the physical evidence, including that final town). This was not a hurry-up job - I expect those bombs had been planted long since.
Whether he had to die in the conflagration is a different question. I sort of agree with kzt, with one very important caveat: he most likely could have escaped if he'd wanted to, but he didn't want to. Dying in the final explosion was his way of taking full responsibility for not putting the evacuation into overdrive when they learned of the Lynx terminus. Whether they could have finished it in time is questionable, but they would have gotten a lot more people out.