Oh, bullsh!t - they damn well do know why and by what groups. They simply do not want to admit it.
http://www.newsweek.com/spate-attacks-catholic-churches-france-sees-altars-desecrated-christ-statue-1370800
Twelve French Churches Attacked, Vandalized in One Week
http://www.breitbart.com/faith/2019/03/20/twelve-french-churches-attacked-vandalized-in-one-week/

The essential American soul is hard, isolate, stoic, and a killer. It has never yet melted. ~ D.H. Lawrence