Concerning Menelik II's agenda, I think a lot of people here mistake what the agendas are for.
As far as I understood, agendas aren't here to represent the mentality of the historical leader, but to make it behaves as close as a human player.
For example, with Menelik II, you'd want to settle on hills, and if someone else is settling near you on hills, you'll hate him and want to invade his cities. Menelik II agenda is here to represent it.
Since agendas are often linked to LUA/CUA, and since the LUA is inspired by the historical leader, agendas make sense often. If Menelik II had an agenda against colonizers or something, then his LUA would make sense.
Also; one thing we often overlooked is that "Leader hates people doing X" doesn't mean he doesn't necessarily approve, it's just that, mechanically, it will lower your relations and thus he'll be more incline to attack you. "Leader will hate X" can mean he will punish you or take advantage of the situation (like Chandragupta: he doesn't "hate" neighbors as much as he wants to take advantage of his LUA).
Catherine de Medici doesn't "like" you because you have high intel over other, but she will try to take advantage of your situation if you have low intel and she has high on you.
Gengis doesn't necessarily "dislike" civs with a strong cavalry, it's just that if, mechanically, he hates you because you have a high cavalry, he will attack you and then use his LUA to gain your army.
Harald doesn't "dislike" you personally when you have no navy, it's just that if you don't have a strong navy, a human player will take his chance at plundering your coast, so Harald will do the same.
Qin, Pedro and Pericles doesn't "punish" you for playing well the game as much as they would react as a human player seeing that you snatched his wonder/GP/city-state when he's tailored for that.
Agendas are tricky because they have to make sense mechanically most importantly, and that's why we can't have Menelik II with an agenda against colonizers because no LUA/CUA/UU/UI offers a bonus against people like it. Same for Gran Columbia. John Curtin and Robert the Bruce have an agenda against colonizers, warmongers and imperialists because it triggers their LUA.