There's only a problem, in the contradictory nature of different paths, if you fail to realise that their differences lie in the difference between their bases (where you begin). Their bases are different because the relative capacities of individuals are different. This means that what is a useful method for one person, could merely be an obstacle for another. Once you have a fundamental understanding of this, it becomes very simple. Then, not only will there be no conflict between different vehicles of Buddhism as to how and when they are presented but; you'll also come to understand the methods of any religion. This is the true basis of tolerance.
p23, Wearing the Body of Visions, Ngakpa Chögyam, Aro Books, 1995, ISBN 1-898185-03-4