Not to spoil anything, but don't you think the synth was added in post?You sure it wasn’t just the synthesizer? ;-)
But yeah, you’re right about respecting other life.
Octopuses are another example of intelligence albeit different to our own.
Octopuses are really interesting when it comes to intelligence. We normally think that the reason humans developed the large brain we have, which is very unpractical in many ways, was that we needed it to become the social beings we are. Octopuses on the other hand are way less social than even cats. When two octopuses meet they normally fight until one is dead. Still, they are incredible intelligent being able to solve pretty complicated tasks, like unscrewing the lid of a jar from the inside. I know several humans that wouldn't be able to do that.
They even seem to have a separate "brain" for each arm. (Some) People have long dreamt about communicating with aliens ("two way SETI"). I would say that they could start by trying to communicate with octopuses, being one of the most "alien" species on Earth, without risking to invite a civilisation that was able to travel faster than light, and that would probably also have similarly advanced ways of enslaving us or just plain annihilate humanity.
Octopuses eyes btw. are very similar to the human eye, even though tracing DNA (way) back has shown that our lowest common ancestor was a (blind) snail.