Dad-to-be Marvin Humes has asked for the witch hunt against X Factor contestants Rylan Clark and Christopher Maloney has to end.
The two contestants have been under fire since Sunday's eviction, as a shock result revealed that contestant Ella Henderson was to leave the show.
Marvin, who is expecting his first child with wife Rochelle Humes, said: "One thing I don't like is the witch hunt that Chris and Rylan have had. I think it's unfair.
"Those guys, what they did was enter a competition to try and change their lives and get exposure, it's not their fault they're still here. People are voting for them."
Bandmate Aston Merrygold added: "It's the same thing that happens every year. Someone has to go. If people don't vote for them, they have to go home. That's how these shows work...
"There's always the same thing, it happened twice our year. That's the drama of the show, it's a TV show and a competition and at the end of the day, someone has to go. It's a platform."
JLS came second in the talent competition in 2009, which catapaulted them from anonymity to international stardom. Marvin admitted that despite the shows ups and downs, their X Factor appearance was essential to their success.
The 27-year-old said: "We obviously tried for a year to try and make it in the traditional way where we managed ourselves and went to record companies for showcases and sent in demos, but it was tough, and the X Factor sort of catapulted us into the industry, so you can't buy that sort of exposure. X Factor helped us massively."
After receiving a string of Twitter abuse across the week, Rylan spoke out on Wednesday.
The budding artist said: "For you that have supported me thank you so much. It means, the world, unlike others, the truth will always out in the end, and I look forward to the day when people see I have been honest and genuine throughout and polite to everyone during this process."
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