"Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. Let a man examine himself, and so eat of the bread and drink of the cup" (1 Cor. 11:27–28).

Yes, we are to examine ourselves, however, it is important to remember that our consciences are to be formed in the truths which the Church teaches.  It is here where there is dispute, not about mercy...  Teaching the truth is merciful for it is in this way we are set free!  The Church is not to allow us to create our own rules and guidelines.  That would be unmerciful.  It is the Church's job, therefore,  to inform us whether or not it is right to receive communion if we are divorced and remarried.   If there are individual cases that remove culpability then it is up to the person to discuss this with his/her priest before receiving communion in this state.