OOC I'm doing this because, well, Rose has more responsibility now, and just treating people as obstacles to be neutralized is one of the failings of both sides in the Ascension War.
That's not true
Both sides respect all human life and give it all the dignity and consideration it deserves
That is to say, since the Apocalypse Canceller consumes 5 points of quintessence every second, and fully rendering down a random mook to quintessence gives you 10 quintessence, if crushing that guy saves you 2 seconds or more, it is the morally correct choice to make
On the other hand, it's also entirely possible this is pretty much what it looks like. Not the primary Serafina, of course, but a non-combat betafork being used as a hostage by desperate scientists who want to get out of here alive. In which case, assuming the risk or the circumstances aren't such that accepting their surrender would be a really bad idea or effectively impossible, we should do it to comply with the laws of war.
Technically, since the Technocracy, through the World Advisory Council, has significant influence over the UN, the Technocratic Union is
technically the arbiter of international law and moreover even if it was not, the Izanagi personnel are Japanese citizens or residents being
technically engaged by the Japanese Self-Defense Forces and therefore this isn't actually a war, but a police action. Therefore the laws of war are inapplicable.
Okay more seriously, what Rose
might know, if someone justifies it IC, is that unlike the high-ranking officials in this facility, randos like these scientists and their shanghaied Vanessas have a reasonable likelihood of getting out alive, but with black marks on their records. They can turn Union's Evidence on the leadership and go "we didn't know! We swear!" Bonus points because in this case they literally didn't know, and probably suspected that it was entirely a rogue operation until, well, it turned out that they deployed some really expensive assets to ruin their day.
The only senior leadership who is likely to escape intact is Dr. Hayate Oufuji, who stabbed them in the back and 'accidentally' dosed everyone who was supposed to secure (and hold hostage) the BSL-4 lab in RIKEN with deadly binary neurotoxins. The other senior leadership is only being captured for interrogation and brain-death/backup destruction when possible. This is why they are not surrendering and why Piero tends to need to beat them into submission by, say, removing every organ in their chest cavity then turning their brain into paste (she has genetic memory encoded in her cell structure to store personality and memory information, she'll be fit for trial in a week). Sometimes he does not succeed, because several of the higher-ups think, reasonably, that Suicide-By-Wargod is a superior alternative to humiliation.
"But what about Sanjeet?"
Sanjeet was a hero of the Technocratic Union who sacrificed himself on Autochthonia to save others.
The Union cannot be allowed to know that one of their heroes has become a traitor. No prisoners.
As Piero knows, the only reason he let Sanjeet say some last words was because he deserved that honor. Nobody would remember them. Nobody would be allowed to remember them.
