This has often been a popular accusation, typically of some form of trying to bring God down to our human level of justice. First off, I dont believe this, and you could just as easily say the same thing about Eternal Damnation.
The main objections based on Egotism stand as thus. A) The Logician says that the idea of a God who is all powerful and Loving is incompatible with Eternal Damnation, whether its active punishment or passively allowing destruction. Or B) The Moral outrage we have with torture, vindictive punishment, indifference to suffering, or tolerance of evil.
Where even we know that the problem of Evil, similar to the problem of Hell is an unavoidable paradox. Since we cannot avoid the reality of suffering, which has baffled many, even in the bible like Job.
But I dont believe this first off
A) ET can be just as egoically motivated, with concepts of consequentialism, the problem of evil, competition, ect. Or vindictive moralism that seeks destruction instead of restoration. So it can be just as egoically motivated. Not saying that all Infernalists think that way
B) The Scriptures are very clear on this matter, which is an indication that we are called to dare to hope for the very than take the safe road of hoping for little just to be safe.
C) UR does not cancel out the stuff that is not warm and fuzzy, and does not deny Hell, but does not dare to claim it as the end of the story for most.
D) UR cancels out Competition, where there has to be love vs. Wrath, Mercy vs. Judgment, or Severity vs. tenderness. And not even in a competitive way that is just compromise, but a paradoxical coexistence.
E) The whole paradoxical nature, of free will, which assumes that if people have a free choice, that it has to necessitate that man is the sole author of their destiny, and God is only there if we choose so. Even though we in reality experience both providence and choice. As to how so, we cannot know.
F) UR does not claim the authority to kick Gods will out of the picture, no matter how much one wants to.
G) UR does not necessitate that Evil as we see it is exactly as it is. From the Heavenly perspective, we really do not know what Good and Evil look like, where from our egoic perspective, Evil is an actual thing. But even our deepest non-egoic understandings know that Evil is only the absence of Good, even if logically it is completely absurd. Yet we truly and deeply experience evil as only a lack of good. But then who are we to claim the authority to define the truth about evil?