Well the ancestors of the Rohirrim had not assisted the Eldar in their war against Morgoth so they never inherited the long life that the Numenoreans did. While those men thrived on their little island, the remnant of the men still in Middle Earth struggled. Their life spans were not extended so in a way, they were lesser in might than their distant relatives.
So by the time of the Kin-Strife, there was a great divide between the Rhovanion and the Numenorean's genetically, enough to cause a bit of chaos when "less noble" blood was mixed. One could say the two kindreds were of a different breed almost, the Numenoreans had a slight amount of elven, and even Maiar, blood coursing through them.
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