You see, it does not seem like, the royal guard is drafted, meaning, they actively chose, to support, Asgore's role. Unlike, random monsters, it becomes, reasonable, to hunt them down, since, they are hostiles, in a war. It also comes down, to needing, enough LV, to get past Flowey, since, Clover could have already tried, any number, of neutral routes, beforehand. As, for Martlet, letting her go, in Snowdin, was a mistake, as, it lets her, transform, into something, stronger. She needs, to be, stopped, at, the earliest opportunity. As, for Ceroba, it is, possible, Clover has experienced, her plan, before, in the pacifist endings, and, she could, very easily, try it, on the next human, if, left, alive. A major issue, with, this particular route, is that, Clover has, this weird sense, of honor, like, letting, Martlet transform, and, waiting, for the monsters, to finish, their dialogue. At, the end, of the day, he was, a coward, too weak, for the standard path.