>Why do his actions generate publicity?
How the public receives him determines the amount of publicity he generates, but I take it that's not the angle you want to get at here.
The bottom line: extraverted functions first and foremost concern information about the object. The focus is objective. So when you give input to the extraverted function of an extravert, the output will largely be shaped according to what the individual sees as "objective" information. For example, when an Fe lead has a positive relationship with a group, they will give feedback in a way that complements the emotional atmosphere as they interpret it. Fe leads are the kinds of people who, when they want beneficial results for their team, they will make the environment positive enough for a project to push forward. Even the negativistic EIE will aim criticism at pre-existing systems in a way that inevitably comes back to a moment of uplift because they want to establish new, better conditions for those around them.
Kanye doesn't do this. Even when the net result provides amusement for the public, he insists that he has grandiose significance as though the public simply fails to see his worth. He seems to possess an air of defensiveness that wouldn't be as pronounced if all of his negative publicity simply amounted to a massive scheme on his part. After all, wouldn't he expect it?
I'm not a mind reader, but I think that when he speaks about himself, his accomplishments, and what he views as his talents, he generally does so to convince others that he's on par with influential people like Steve Jobs, Shakespeare, Disney, etc. He seems earnest. More recently, compared himself to Donald Trump, claiming they are both "dragon energy." Here, he's likely being earnest because he and Trump in fact have some similar characteristics. They are both shock jocks who go against the grain of establishments and public opinion - in my view, both Se ego types.
When he makes statements about topics other than himself, I think he often does so because he feels that he has something profound to get off his chest. For example, when he claimed that "George Bush doesn't care about black people", he seemed to do so because he received bits of information that eventually culminated as this controversial conclusion with the help of Ni in the background.
Fe seems absent from all of this. People shit their pants when he speaks up because he contrasts with the emotional vibe in a way that pays no heed to the emotional context.
>Is it leading to something bigger?
Yes, it does lead to something bigger, but that doesn't mean he's Ni ego. Trump became POTUS through publicity but that doesn't mean he's Ni ego.
I don't want to distract you, so let's just get to the point - if Kanye was a beta with Ni ego, he would possess strong -Ni. Let's look at Gulenko's description of -Ni:
"-Ni
= desire to bypass danger. They aim to avoid previously committed mistakes. In their groups, experience, skill, know-how, sophistication are highly valued. They feel confident in extreme situations. "
If Kanye wanted to bypass danger, wouldn't he avoid making public statements that make people question his judgment? Furthermore, if he wanted to avoid previously committed mistakes, wouldn't he mix things up more to lead people away from the thought that he's an idiot? The Ni ego types I know operate with a mind-boggling level of discretion, and I don't see that with Kanye.
>Does he intentionally want to generate publicity?
I think he likes attention, which undermines the discretion Ni ego types tend to value.
>Does he believe it's going to further an ideal that he has? Is it for himself? Is it truly outwards?
This depends on how you define "ideal." At this stage, it's hard not to think he has a vision for success, but in my view, he has primarily wanted to service his own ego. He even made a song about his ego trips and life in the public eye:
To be fair, considering his mom's death, West has some scars of personal tragedy mixed up in his behavior. Ie. he has self-destructive tendencies, perhaps characteristic of someone with survivor's guilt or simply loss. But still, he looks like an Fi lead gamma to me.