Some people choose to be small. For instance, they only want money (lots of money, perhaps) and not "power". Money is power, but distinguishing "money" from "power" makes a certain amount of sense. "Power" is bigger-aimed than "money". Someone with a lot of money can rule over 100 servants or employees, but someone with a lot of power can rule over an entire nation. Someone with power might have a grand view of themselves, a noble view. This could be the case with someone with money as well, but the money person could more easily have a small view of themselves, and I would guess would be less prone to having a grand or noble view of themselves. They might then look at the "power" people as "pretentious", "ambitious", "tryhards", or something like that. The "power" people might look at them as "petty".
One would think that at the level of national government, everyone would be ambitious. This might be somewhat true. But, there can still be pettiness at that level. For instance, government corruption is a characteristically petty phenomenon, redirecting public (larger-aimed) resources for personal (smaller-aimed) purposes. But, even on the level of grandness, there can be pettiness.
If you are fighting for your own nation (tribe, religion), have you considered fighting (or working) for what is higher? What is higher than for everyone to be like God? Maybe your nation / tribe / religion has a unique insight into being like God that must be preserved and shared. Wouldn't cross-cultural, ideally interpersonal, contact involving trustworthy people do more to help that happen, than wars or other coercive actions? Wars and coercion make a stink out of you and make your beliefs seem (or even be) untrustworthy.
The petty can say "well, yes, we are petty, but at least we are not... prideful, arrogant, self-aggrandizing, pretentious". I think that these potential twisted versions of large-aimedness are a valid concern for anyone who does not want to be petty. Any path can be well-pursued, well-implemented, or not. Was Jesus prideful, arrogant, self-aggrandizing, or pretentious? People may have thought he was, but was he? There is a way to not be petty and still not be abusive or fake.
Perhaps it is good to distinguish "ambitious" from "reality-aimed". The ambitious person wants to do large things. But it is their residual petty-mindedness that allows them, once they have done a large thing, to be twisted about it, for instance to feel or express a sense of superiority gained from it, to feel justified to do bad things because of it, or feel entitled because of it. Because if they were aimed at reality, they would be aimed at something so rigorous and total that it would call from them more than they could ever give. They could merely devote 100% to pursuing that reality.
Moral truth is satisfied only when there is no more good that needs to be done, and desires that all sentient beings are 100% in tune with the good.