They're offended for the same fundamental reason that a whole bunch of us conservatives are offended.
The modern world doesn't accept the beliefs they've had all their life, from infancy to adulthood.
I'm offended for the same reasons: PResident Obama has attacked and derided my fundamental beliefs in our justice and legal system, as based on our U.S. Constitution, that this Constitution is the basis of the laws we have today, establishing certain rights and freedoms, that he trashes every day through merely ignoring it and its precedents and/or authoring executive orders in contradiction to its specific language.
But I don't go around rioting, raping, and murdering people because of his actions.
Or, maybe they’re merely jealous.