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That sounds like he was trying to act like a father might to protect his family from the bad guys.
Sound like you didn't check one of the recently supplied links to another FR thread; Philadelphias immigration lessons: How fear and hatred led to 19th century riots, which had link to the source for that article http://catholicphilly.com/2013/06/news/local-news/local-catholic-news/philadelphias-immigration-lessons-how-fear-and-hatred-led-to-19th-century-riots/ where you would have been able to see;
Meanwhile Bishop Kenrick, who issued an order to temporarily close the Catholic churches and pleaded for an end of violence, took refuge in the country.