well, in my opinion, everyone who wants to manipulate others is ruthless. if you think people who conquer other individuals by the force of violence, then we are talking the different topics.
nowadays people, especially goverments,are willing to use some soft power to achieve their control of others, such as delivering a speech and giving something preferential. in fact,there is little use of violence against the enemies. i don't know wheather the usa often choose wars or other weapons to control another poor country. ok. i hope i don't confuse you. i want to say that even some people survive by displaying their vulnerability and broadcasting love, maybe they are still ruthless people. people can pretend themselves with a nice side. maybe someone who appears to be kind and gentle is exactly the one who doesn't care others at all. so i want to say the ruthlessness will be the fittest, especially for hypocritical people