@Carmilla:
As it was already said, Kyros did it because of his own low self-image. Like I said, even if people didn't lie and said they accepted him, Kyros still wouldn't consider himself worthy of it or worthy of living with Rebecca openly.
In 796, Kyros directly says that he's doing it for the sake of Rebeccas future, that he wouldn't want her to "throw it away". We know Kyros used to be a bad egg involved in dangerous work, but in the present he's a pretty stand-up guy who retired as a farmer and has no visible enemies, so its not like Rebeccas future is somehow in danger from Kyros personally. That leaves her future being compromised in terms of image, by the publics perception of Kyros rubbing negatively off on her - "Oh my lord, to think our princess is the daughter of a commoner, and it's that rowdy brute Kyros to boot, how scandalous, I'll never accept her!" type of thing.
Plus, Kyros whole escape scheme is directly dependent on his (mis)conception of how the nation sees him, and what they know. If anyone in the country had spoken out that the jig was up, he wouldn't have been able to try and dump Rebecca in the palace with a bogus backstory of her "true" lineage. In that case Kyros could've still taken off, sure, looking like even more of a complete overreaction, because his past is just that bad you guys. Of course, if we guess that Kyros would've left either way, this begs the question of what the point is to reveal the citizens knowledge (apart from adressing their attitude flip/flop towards Luffy)
Speaking of Kyros, probably my biggest problem with him is that I don't buy his troubled past for a second. We sure do hear about it a lot, mostly from Kyros himself, but we never actually see his supposed baggage which he repents so hard that he makes Kumadori look restrained. The most we get is a shot of him having clubbed King Riku, looking about as threatening as Kid Ace. He gets to be angry for 2 pages, where its revealed that he killed people who targeted his friends (so he's not that bad), and then 2 pages after that his anger is gone, and he's crying about how his dark past haunts him and he wishes people would just forget him. At this point we've already had the last instance of citizens dissaproving of him, early into his 4 year Coliseum career, and by the next chapter he's got his own troupe of fangirls, and the only one to take issue with him is a woman who falls for him literally 1 page later. Theres even Viola to vouch that his heart is pure.
All this combines to make Kyros supposed inexcusable history really really hard to buy into, especially when people like Bellamy (who'll stab you, shoot you, have you torched and thrown out from a tower) can come around to the heroes side.
Kyros is no Chocolove.