So, I will try to explain though I maybe wrong....
First, at the current timeline, the ‘bad summoner’ has not yet summon the demons army. So people are not yet hating/wary of summoners.
Second, at the current time, summoners are rare, especially those that can summon many or a big sacred magic beast like FL. Summoners like these are very appreciated for military and political purpose (for the King).
Third, at this time, some demons or magic beast are roaming/appear randomly/summoned sometimes at much smaller number. Or possible to create some using the prohibited method like that red ball you see on previous chapter. But, demons army are not out/not yet summoned.
Fourth, the reason why the Red guy hating summoners is possibly because past experience where a summoners use their magic beast to harm someone precious to him, or actually betrayed him. So right now, he really think that he can’t trust a summoners. However, when the demons armies arrived (future-time), many humans has killed, it possible include his families member, which fuel into his hatred.
Fifth, in past life, the reason why Redguy and everyone else spared Gaspal’s life, is because Gaspal and some small number of other summoner were already well-known far before the demon-armies incident. AND, humans really need those summoners power to help to protect them and also with the subjugation. That’s why FL really scared because she is a summoner but not known yet by anyone. If by any chance at that time she somehow revealed herself, she would most likely will be killed by the Redguy.
Like, “why is this girl hiding her power until now? She migh be on cahoot with the bad guy!”
thanks for the clarification! the different timelines are confusing sometimes
after binge reading till the recent chapter theres something that seems to bother me, summoners have a bad rep basically for working for the demon lord, and just generally being a dangerous practice. BUT the EMPEROR and the citizens think that summoning is pretty neat, even Gaspal (the blonde old fiance) was basically BANKING on being a "summoner" literally became famous for it... so like why does the red guy hate summoners them so much? maybe it can be a personal hatred but i just think that its weird how the red guy can (in the past life) work w the old Gaspal who was a famous "summoner"???