[sjy]

There is a great explanation of the difference between 'because of' and 'out of' in an answer to this question on English Language Learners SE [1]:

> You should use "because of" in cases like this when the thing in question is the catalyst for something to happen, and use "out of" when the thing in question metaphorically "gives rise" to something else.

[1]: https://ell.stackexchange.com/questions/115445/can-i-use-bec...

[close04]

I always assumed out of necessity idiom means no other choice. And because of would mean I have choices and this is the justification for the one I made.

For the purpose of the comment "out of need" felt a lot more appropriate for an animal that kills.