If the SFA or SFL (as it was) had done something to tackle those two we wouldn't be in this position now.
Sectarianism was good for business, that's why Rangers fans got to sing about being 'up to their knees in f****n blood' even after a Celtic fan had his throat slit for wearing the wrong scarf in the wrong place.
UEFA for all their faults were/are the only organisation to stand up to these two.