Rashi quotes the Medrash that אליעזר really wanted his daughter to marry יצחק. In fact, אליעזר was a great man. Chazal describe him as "מושל בתורת רבו", "דולה ומשקה מתורת רבו לאחרים", and yet his daughter cannot marry יצחק. Why not? Chazal don't say that his daughter was not appropriate for יצחק, and in fact, the fact that אליעזר wanted her to marry יצחק would seem to indicate that she was worthy. Chazal explain (quoted by Rashi) that Avraham told him:
בני ברוך ואתה ארור ואין ארור מדבק בברוך
My son is blessed and you are cursed (Eliezer was a descendent of Canaan who was cursed by Noach) and the cursed cannot marry(?) the blessed
אליעזר was a great man, he servedAvraham Avinu faithfully and learned all his Torah. His daughter did nothing wrong. And yet, his daughter is ארור and cannot marry Yitzchak.
We see here that the Torah's hashkafa is very different from the Western one. In the West, who your ancestors are is supposed to be irrelevant, every person is supposed to be judged on their own merits. However, we see from Eliezer's daughter, that this is not the Torah view. She may very well have been suitable to marry Yitzchak, yet she cannot marry Yitzchak because she is descended from a line that is ארור. We see the same idea by a ממזר. A ממזר did nothing wrong, he had no choice in the matter and yet, he and his descendents can never marry a regular Jewish man. Our Western upbringing screams, it's not fair? The answer is that the Torah has it's own value system which is very divergent from the western one.
This relates to the discussion that Chardal is having Casualties of legitimate war where some of the commenters were very offended by his stating of the Torah position that there is nothing wrong with killing civilians in war. There is no doubt that from the Western perspective of war, killing civilians is wrong, immoral, offensive, etc. However, the fact is that the Torah has a different perspective on this and from the Torah perspective killing civilians is not only allowed but required (see the Rambam in Hilchos Melachim Perek 6).
We who grow up in the West and participate in the culture need to take particluar care that we internalize the Torah position and not the Western one.