First of all, the French never openly attacked American colonialist or their interest. The Native Americans did at French instigation but that's a big so what. The British were vastly more guilty of instigating Native American atrocities against American colonist then the French ever did and they instigated those attacks against American colonist for a far longer period of time. From 1776 to 1814.
I'm sure Franklin did have a problem with French instigated Indian attacks. He also had a problem when Sir William Johnson did the same thing when he manipulated the Iroquis leage to attack pro French colonist and French Colonial interest in New York State. Franklin was particularly outraged at Johnson and pro British interest for their involvement in the Wyoming Valley massacre.
To reemphasize my point. The British were far more guility of instigating Native American attacks on colonist then the French who, in their dealings with Native Americans, were admirably more peacefull then Anglo relationships. French relations with Native Americans were primarily based on trade and were generaly peaceful. Anglo-British relations with Native Americans were based on conquest of land and were much more violent.
For further reading on the events of the 7 years war in North America I suggest reading Allan Eckerts "The Wilderness Empire". It's a great read.