I think we should realize the status of Sacred linage is one of the fundamental theological difference b/w the two major sects in Islam.., a difference that has existed for over 1300 years.., rather then debating or trying to proove which belief is more correct, we should accept the difference & try to find common ground on so many other shared aspects of our faith & beliefs
you are right:
we should
(1) accept the difference
(2) try to find the common grounds
and there is another thing we should not forget
(3) we should try to understand what the other sect is saying.
most of the people in other sect even dont understand what shias are saying.
they think that shia give importance to "the linage". actually its not.
Shias give importance to "Naas".
example: Shias accept him as an imam; not because of "he is son of". He is imam because there is a Naas for him. that is it.