I didn't look any deeper into 5e paladin oaths than respeccing Kerz, but that's the lawful alignment aspect of paladins. 2e-dungeon masters were even warned not to subject player paladins to certain moral dilemmas that allowed no lawful good way forward because they would lose their class. Back then, there was no path of atonement in the basic rules. You'd just end up as a regular fighter, or dying as a paladin. To my mostly chaotic tabletop group, being a paladin means you're some sort of dangerous loony.