The phrase "are far less prone" is correct and usable in written English.
It can be used to indicate a lower likelihood or susceptibility to something compared to another subject.
Example: "Children are far less prone to severe illness than the elderly."
Alternatives: "are significantly less likely" or "are much less susceptible".
They smile more often and are far less prone to aggression.
Satellite phones equal or surpass most cellphones in reception and sound quality, and are far less prone to the static that plagued models a few years ago.
"The revolt against holders of power is not a revolt of the poor against the rich: ordinary people are far less prone to resent other people's success, than intellectuals suppose.
(Philosophers of the physical and biological sciences are far less prone to make this mistake about the meta-level work of reflective scientists in these domains).
Outside of the debate halls, Donald Trump famously called Mexican immigrants "rapists" who are "bringing crime," despite the fact that immigrants are far less prone to crime than native-born Americans.
Although cellular targets are far less prone to mutational escape, the long-term side effects are unclear.
Mr. Egan's business model is far less prone to compromise and corruption.
Shane Warne earned scorn for comparing winning the first IPL with the Ashes, but Hussey is far less prone to hyperbole.
Valentine's counterpart with the Yankees, Joe Girardi, is far less prone to making comments that could incite rivals, giving Valentine less material to feed off.
While side-by-sides appear to be far less prone to accidents than A.T.V.'s, federal officials are pushing toward mandatory regulations to make them safer.
Smith acknowledged that fossils can be tainted by the material in which they're buried, but dental enamel is far less porous than bone, so it is far less prone to contamination.
