That is a good point to raise, but I disagree that pleasure is good because it is good. I also don't just take it as granted. I think the notion that pleasure is good is actually the only one which means
the lack of an arbitrary selection of value, while hence any other notion which is not based on "plasure is good" means such an arbitrary selection.
To follow this line of thought, one needs to realize the ultimate and universal source of all human motivation and hence all value humans may perceive. Which are emotional urges. The satisfaction of such urges is what constitutes pleasure as I understand it. Hence, pleasure is the only objective criteria of the fulfillment of human needs.
Which means, that ideals like justice, honesty, kindness or whatever have to be understood as mere tools of creating pleasure, or they as said arbitrary and inevitably select for some emotional urges over others.
The problem just is, that this truth (if you forgive me this arrogant term

) is very far removed from practical experience. Pleasure is such a complex critera, there are so many variables and complex causal relations involved, that in practise it can easily becomes totally infeasible as a stand-alone criteria. So we look for rough abstractions of what good means, to compensate, to have something to orientate on. This is what IMO ideals are. What non-utilitarian ethical philosophy comes down to.