Is hate the only thing that can make the world a better place?

No

Very much yes

Naaaah

No, but it is the only thing that could make it worse.

All evil acts start with hate.

Nah. If everyone smoked a blunt a day and lived by the beach, the world would be a better place.

Less religious ignorance & make believe would be good.

Well, discontent leads to hate, which can lead to action (positive or negative) which might cause a change-but will that change be good or bad?

Hating alone isn't enough. Once we know what the problem is and we hate it, the next step i to take action and destroy whatever is causing all this death and destruction so that the world becomes more peaceful. Btw Im obviously talking about islam.