If we observe abuses and do not do something about it, are we not partially to blame? As someone mentioned, this is our church! We are worshipping The Father, The Son, and The Holy Spirit. Abuse may come from many different sources and may be superficial or deep and serious.
I have never reported any abuse. I pray to God that I never witness a situation that puts me in such a position. What I have witnessed are problems with the liturgy that have been discussed in the GIRM or in updates from
ZENIT.org. When these problems have been noticed I have waited until after mass, then quietly walked up to the person and GENTLY mentioned the problem and where they could read about how to deal with a similar problem.
Problems have included: spilled wine, dropped hosts, improper presentation of the cup holding The Precious Blood, tabernacle left open during parts of mass, etc. The other problems such as hand holding during the Our Father, clapping, talking, cell phones, gameboys, headphones worn by the altar servers, etc, I just pray, pray and pray that they learn why so many Catholics are reverent when in church.
At my oldest daughters First Communion, before mass, the assembled parents, families and friends were making so much noise that you could not hear yourself think. One of the parents went to the microphone and reminded people that this is a church, that Our Lord Jesus Christ is present and we should be quiet, reverent, and prayerful. Her announcement was NOT well received. It took less than five minutes for the noise level to resume its former level. That is also the last time I saw her at our church. She was reporting an abuse to the abusers. Yes there were two priests present, but they choose to not say or do anything.
So far, the people have accepted my comments and there has not been a confrontation. It is really hard to address even the minor issues with some people or priests. So many do not know what the GIRM is (as an example), or they have responded that this is the way it has always been done, or I have so many other parish matters to attend to (that this problem is Sooooo minor, that it is not worth Fathers time). So we should pray, and try to do the best we can to lead a Christ filled life.
God Bless