Are Ultra-Orthodox Jews secret Muslims?

Ultra-Orthodox Jews are apparently harassing other Israelis, including vandalizing bakeries open for passover and harassing small-girls on their way to co-ed elementary schools.

EagleUSA therefore has this question:

This is hard to understand. With all the problems and issues the Israelis are facing, that these “extremists” (whatever that means) are stirring up problems within the Jewish country.

This begs the question: Are they really Israelis, or Muslims in sheeps garb??

I suppose it's a small step from 'All Muslims are extremists' to 'all extremists are Muslim.'