I mean, imagine youself in a situation where someone is deathly danger and you have some sort of weapon on you, would you kill the agressor to save the life he is threathening ?

Hmm, possibly. I'm not sure

No. In my eyes, no life is more important than another's (humans only right?)

Yes, police officers do that all the time.

However, I would try to use a non-lethal weapon (Taser, etc.) first.

well if i didn't like the person that's going to be ki-
nvm.
perhaps.

I would shoot the **** outta them