Same here. I don't think I've ever even seen an episode of either of the two shows. But I've seen a fair amount of the dating shows that came about after its success, and they're all about the same. People get to spend time with the central person as a group, and then they also get the option of picking some of the "candidates" for one on one dates. At the end of every episode, there is an elimination ceremony where a pre-determined number of candidates get eliminated. This culminates into a final episode where the central person has to choose between two or three people.
There's a very good chance that there isn't any intentional malice behind the lack of PoC staying in the game longer. But there's also a possibility that there is. We don't know who these producers are or what they're like. And there has been speculation for years that these dating shows are fixed, where the people in charge of the show decide who they want the central person to choose, and put that in their contract. If that is indeed true, I think it's not that unlikely that the show creators would have the central person choose someone that they think their viewers are going to like the best.
While most Americans are probably okay with inter-racial couples for the most part, if presented a choice, they're ultimately going to pick a partner for someone who looks good with the other person, someone that looks a lot like that person. I don't even think it's a conscious thing, but a lot of people get themselves worked up about how cute a couple is or isn't, based purely on physical traits. If you get a short girl and a really tall guy together, people wonder why they're together. Same thing if you have one person who is significantly more attractive than the other. When it comes right down to it, Americans as a whole are incredibly superficial in this manner. Not everybody is like this of course, but the type of people who watch these shows on a regular basis, most likely are. About the only time viewers aren't going to like a pretty girl that looks good with the guy, is if she presents herself as a bitch or a gold digger.
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