First of all, 27% of the girls in the Chasidic, Ashkenazi school are sephardi, and 6 of the 9 mothers that were sentenced to jail terms for discrimination were sephardi (sephardim going to jail because of alleged discrimination against sephardim!). Because none of these girls is chasidic, and it's a chasidic school, it's hard to make a strong case for discrimination (despite the Supreme Court's ruling). The other two examples of inner disputes you gave reflect fundamental theological differences that caused schisms and wars. There are no such fundamental theological differences between sephardim and ashkenazim. Any substantive theological differences are very minor in the scheme of things. There are cultural differences, which are mainly caused by the primary European and Western origin of one group, and the primary Middle-eastern origin of the other.
Egypt says verdict in Al-Jazeera case expected Saturday (AP)
from the article: Analysis / The ultra-Orthodox are returning Israel to the middle ages