Just as it irritates me when people insist on applying a euphemism for homicide bombers (by calling them suicide bombers), I truly wish people would call evil by its real name, and stop referring to evil as being sick. They are not synonymous.
Sick people do not conspire in and plot and premeditate the murders of innocents.
Evil people do calculate, relish in, and rationalize away the willful destruction of innocent people.
Was Tim McVeigh a homicide bomber? I suppose so. After all, he did kill 168 people.
But he lit the fuse and walked away. Suppose, instead, that, stoked up on Allah, he'd been motivated to drive the truck straight into the building lobby and kill 268, perhaps, instead of only 168. He'd still have been a homicide bomber. But a more specific designation would be available: suicide bomber. Nothing euphemistic or PC about it.
Words are funny. Recently, a friend referred to the BLU 82 as a "15,000 pound martyr maker". I wondered why I chuckled at his use of the word martyr. I think I must have enjoyed the implied sneer at the twisted religiosity of the bomb's intended victims.