Sure, he was killed when he tried to intervene to save Tasha, but look at what happened to the rest of the
Enterprise-C survivors. Tasha became a sex slave, and the rest of them were probably interrogated (possibly also tortured) and eventually executed.
Sela said that part of Tasha's bargain with General Volskiar was that the rest of the survivors would be spared (although even then, they'd have had to stay on Romulus for the rest of their lives, probably in some rat-hole prison, so I'd hardly call that a bonus), but when Tasha was killed trying to escape, I'm sure the Romulans welched on that deal.
When the novel first came out I held out some hope that at the end, when Charvanek became head of Romulan intelligence, she might have arranged for the Ent-C survivors to be released somehow - maybe gave them some old cargo transport and clearance codes out of Romulan space. Guess we can still hope she did that. Otherwise, those people would have been in for imprisonment, torture and death, probably.
