Maybe the first thing is to get perspective. From the Catholic Catechism we see the place of relics in the life of the Church. That place is behind Sacraments and behind the primary Sacramentals under Popular Piety:
1670 Sacramentals do not confer the grace of the Holy Spirit in the way that the sacraments do, … "For well-disposed members of the faithful, …sacramentals sanctifies almost every event of their lives with the divine grace which flows from…the Passionn, Death, and Resurrection of Christ. From this source all sacraments and sacramentals draw their power. There is scarcely any proper use of material things which cannot be thus directed toward the sanctification of men and the praise of God."176
Various forms of sacramentals
1671 Among sacramentals blessings (of persons, meals, objects, and places) come first…
1674 Besides sacramental liturgy and sacramentals, catechesis must take into account the forms of piety and popular devotions among the faithful. The religious sense of the Christian people has always found expression in various forms of piety surrounding the Church’s sacramental life, such as the** veneration of relics**, visits to sanctuaries, pilgrimages, processions, the stations of the cross, religious dances, the rosary, medals,180 etc. (emphasis added)
My point is that relics are way down on the list of things important to the life of grace. Sacraments are numero uno; then those sacramentals which are blessings–then the rest, including relics.
Let me ask you a question: do you keep any physical reminder of a deceased loved one? Such as an apron that Grandma used to wear–something you keep not to wear or use, but because it belonged to somebody special?
I’ve got my dear deceased dad’s aviator glasses. I just keep them dusted off, I don’t wear them. Sometimes I touch them.
Do you do anything like that?
Having such relic is “in a sense” having the person who owned the item. By touching the aviator glasses I am connected in some way to Dad, who also touched them.
When it is a lock of hair of a deceased loved one, it is cherished, no?
What if it is a lock of hair of a deceased saint–very precious, no?
Did you see the movie Passion of the Christ, where Mary brings linens and wipes up Christ’s Blood from the paving stones after the scourging? Was she wrong to do this, instead of washing it away with buckets of water or just letting it go? Was she emotionally unbalanced and it was an act of insanity? Or is there a proper reason to get that blood onto the linen?