My heart goes out to the families of the cartoonist and others who were killed in the senseless violence at the offices of Charlie Hebdo. Cartoons are incredibly powerful, and it is the responsibility of the cartoonist to use her power for good. The cartoonists who were killed did just that in their own way; it is a provocative way, but that is their right.  I mourn the loss of these cartoonists as champions of freedom of expression.  My solution to revenge their killing is to draw for peace at every opportunity.