Romans 14:13-16: How to never be a stumbling block

Introduction:

What do these three situations have in common: a pastor uses his hunting rifle to kill an abortion doctor; an Evangelist walks into a mosque and shouts out that Islam is idolatry; the parents of a teenager who has announced himself gay lose their tempers and verbally assault him calling a pervert and other things?  All three are right in a wrong way, all three have the truth but without love. Abortion is wrong, Islam is a false religion and homosexuality is a distortion of the way God made us, but we can be right in a wrong way.  This is what is going on in the Roman Church in the matter of the weak and strong. The strong are right, their theology is correct, but they are right in a wrong way.