Saying “All Lives Matter” is like hiding the gift of God away, afraid to invest it for fear of loss. It is a rejection of our scriptural mandate to believe (not just intellectually assent) that Jesus Christ is Lord.
According to Paul, our Christian duty, when those lines are drawn, is always to step onto the other side.
I’ve found, though, that when people dismiss the question “why” on matters of faith, it tends to limit the experience. Those “trust and obey” traditions feel empty and deficient and entirely unsatisfactory. When the “why” is encouraged, though – or at least tolerated – the expansive nature of God and faith becomes real; the power and potential of the divine in the world seems limitless and worthwhile.