and (by) the risk-aversion

"[...] our findings indicated that young people are increasingly affected by the culture of fear, and the risk-aversion and obsession with safety that have become defining features of contemporary society."
(Watching the English; Kate Fox)

I suppose I should read it as follows:
"...young people are increasingly affected by the culture of fear, and (by) the risk-aversion and obsession with safety...".

If it is so would the second by (in bold) sound idiomatic?

Thanks.

Quote:

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Originally Posted by suprunp

"[...] our findings indicated that young people are increasingly affected by the culture of fear, and the risk-aversion and obsession with safety that have become defining features of contemporary society."
(Watching the English; Kate Fox)

I suppose I should read it as follows:
"...young people are increasingly affected by the culture of fear, and (by) the risk-aversion and obsession with safety...".

If it is so would the second by (in bold) sound idiomatic?

Thanks.

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I prefer it with "by".