The goal is survival. Who is fittest? Those who embrace their ruthlessness and dominate or those who display their vulnerability and broadcast love? One draws people together by force. The other draws people together in trust.
Who wins in the end?
The OP is interesting in itself. It seems to set no framework, nor will it offer any usable definitions on what constitutes 'survival', even though in modern society 'survival' is a pretty complex business, which requires the input of a lot labor and effort from numerous people (even if only looking at the basics, food to eat, drinks to drink(heck, even just plain water to drink these days), clothes to wear and a place to stay and keep the weather at bay.
Given just that, I'd say in the short term 'the ruthless' would have better survival odds, since they are capable to get what they need by force, by subjugation of others (namely, 'the meek'). However, such situations rarely last long: eventually, the oppressors will grow weak, or their offspring will be less ruthless, or less capable to maintain the force necessary to stay 'ruthless' enough in the eyes of the oppressed and therefore discontent others.
At such times, the oppressor(and family) will usually be disposed off. And another will take their place, since by then a societal structure has been formed, which greatly facilitates 'the ruthless'. It's probably the ones most discontent with the previous ruthless oppressors that will wind up replacing them, and therefore maintain the status quo of 'the ruthless' oppressing 'the meek'.
Supposedly, 'the meek' could work together to survive, without use of force. However, the type of society that would come into existence would be vulnerable to any outside or native 'ruthless' people, willing to take more for themselves at the behest of those too meek to stand up to them.
So, in the final analysis, for me, it would inevitably end in a situation where the ruthless will form a society where they can use force effectively to have others help them survive.
Whether or not I believe this to be true is something else entirely: in real life, people and situations are much more complex and multi-faceted...