Oh it was 100% the right choice and completely justifiable.
It’s just that the “code against killing” is one of Spider-Man’s defining traits. He tries to save Vulture after getting beaten to a pulp by the guy, and even steps in to save Glover’s character without even knowing the guy (other than someone buying illegal weapons).
But it’s clearly NOT a problem for Stark and never has been
What I will say is that we don’t know if this Spider-Man has that code. He has Tony Stark for a mentor who threw him in an Avengers battle after one meeting. This Spidey might be a bit of a lunatic.
Perhaps it wasn’t such a dilemma for him because Ebony Maw wasn’t exactly... human? A non-human who was very dangerous and powerful, no less.
This was the first time this Spider-Man dealt with a vicious otherworldly creature like Ebony Maw, and knowing what could happened if he didn’t attempt something a little extreme, it seems realistic Peter wouldn’t have second thoughts about killing someone from another world who was a major threat to him and the whole universe.
That said, I see where you’re coming from. I didn’t give this scene much thought at first but when I think about it, it does raises some questions. For all we know, Peter might’ve wanted to prove himself to Stark more than anything. But in the end, Pete had the right idea. Thank goodness for his movie-watching!
Some situations are kill or be killed. Hero’s should not kill to a certain extent though. A lot of people for get that Superman, Spider-Man, Batman and other hero’s have killed before.
I think that’s the key - however he sounded, Ebony Maw was a creature, a very dangerous one posing a very real and immediate threat to the wizard
Added to which, it was Tony who actually blew a hole in the ship. Peter was too busy saving Strange to do anything else
Bottom line, I think the scene “feels” right because there was clearly no other choice AND Peter’s need to impress Stark overrides pretty much every other impulse
I'd guess that the morality of not killing doesn't necessarily extend to alien monsters using magical powers in an attempt to kill half of all humans. I mean, if he'll eat a cheeseburger, I think he should be okay with something that might kill an evil, homicidal, alien creature.
Not a big follower of the comics and have seen only a handful of these MU films, so this was the first time I'd seen this character before. He seemed pretty powerful which makes it kind of disappointing if he was killed off by that. From his reactions and his handling of these 3 superheroes earlier in the film, it's like he should have been able to escape that fate.
I think you pretty much answer your own question. The universe was at stake. It was a villain who was actively participating in helping to off half of all life. The stakes were high enough that it wasn't a problem for him.