No one disputes that this is a major problem that must be prioritized. But according to Palestinian media, the Euro-Mediterranean Human Rights Monitor is accusing Israel of being complicit in these murders. (This is not on their webpage as of this writing.)
They don't even pretend to have any proof of this slander. They just say "the recurrence of murders and the analysis of their facts and their unprecedented rise indicate the existence of an Israeli policy that perpetuates impunity and encourages the commission of these crimes."
Their main evidence of this is that Israel manages to determine who is behind terror attacks, so why can't it do the same for Arabs internally? The answer is obvious: it took decades to build an excellent intelligence infrastructure that can now be leveraged. It would take time to do the same for Israeli Arabs, but there are additional obstacles - citizens cannot be treated as presumed enemies. Imagine the backlash if Israeli police put spies in Israeli mosques. It requires a completely different skill set to attack this problem, and Euro-Med almost certainly knows this.
The Euro-Mediterranean Human Rights Monitor doesn't seem to care about human rights of Israeli Arabs nearly as much as they want to use them as yet another excuse to bash Israel.