PSA comes out of the Reformed take on sacrifice. Once you treat the blood of animal sacrifices as satisfying a punishment owed by the sinner, the whole thing goes off the rails. Hebrews, and the Leviticus it points back to, says blood purifies and consecrates things to God. It's not a payment to God, it's a dedication to Him. A worshipper under the old covenant was sitting down to a meal with his Creator and King. The objects used for this, like God's altar, had to be blessed for that purpose. Living among sinful people gradually made the holy objects common again. It took Christ entering the Heavenly Tabernacle and offering His blood to make the temple of the new covenant permanently pure and set apart for Him. That's why at every liturgy we celebrate and thank Him with a peace offering of leavened bread and wine. It's still the same worship He gave at Mt. Sinai 3000 years ago.