Intentional homicide rates are about three times higher in the US (4.8 per 100,000) than in Israel (1.8 per 100,000). Just because the protection is much more obvious and close to home in Israel, and violence there is felt much more throughout the Jewish community does not mean it is any more dangerous.
I lived in Alon Shvut for a year; I hitchhiked from the very spot that they were kidnapped from about a hundred times. Is it completely safe? No. But it is the culture, and I think that needs to change ASAP.
Regardless, blaming the boys' parents is uneducated, insensitive, and wrong on many levels. Now is a time for us to be united, not attacking each other.
Can't compare the overall US rate or compare the overall Israeli rate to the settlements.
1) The US is a large place, for example Detroit's rate is 54.6 per 100,000 so places like that skew the average. Consider Ocean county NJ where the rate is about 1.08 per 100,000.
(BTW Rabbi Aviner's numbers are way off)
2) The overall Israeli rate might not be representative of the rate in Yesha. Again averages skew the results. Saying that Israel as a whole is safe, isn't saying anything about what the Satmer Rebbe said.