Re "Let his blood...": To Be Fair...

There is another interpretation of that: when Pilate said what he said (which is another discussion, too), those who said "Let his blood..." could've just been saying, "Fine! If that's the case, then let it be," kind of like Gamaliel in Acts 5: that is, basically, "If it is, it is; if it ain't, it ain't."

Besides, IMO, the Catholic Church and other churches have sorely misinterpreted both instances:

1. If Pilate really believed Jesus innocent, would he really have murdered him? Besides, the "Let his blood.." crowd was looking at the situation from one interpretation of Deuteronomy 13.
2. There is no proof in the New Testament or outside of the New Testament that Gamaliel was anything but religiously tolerant, and to turn that into Gamaliel becoming a Christian was a proselytizy and unChristian trick. 
3. Jesus would remind the Catholic Church and other churches, "Thou shalt not bear false witness" and "Neither add to nor take from what [Moses] command[eth] thee, that thou mayest keep the commandments of  יהוה‎ thy God that [he] command[eth] thee."

By adding to and taking from from both Tanakh (and, if you believe like I believe, the New Testament), the Catholic and many other churches have revealed themselves to be and devolved into something that Jesus did not intend, whether one believes Jesus simply to have been a Torah-observant Jew and rabbi with some followers, Mashiach, or someone or something else altogether. 

For two examples in my area, by the way:

1. Notre Dame of Maryland University—and though I forgive, I never forget and will never forget. The fact that we've survived for over 3,000 years and survived people like certain Religious Studies professors at NDMU proves that, for instance, the Exodus was not just "an ancient peasant rebellion" or Passover something that we "stole...from the Syrians". By the way, Jacob "was a wandering Aramean"; and Arameans were Syrians (How's that doctorate working for you now, Professor?).
2. Father Maskell¹.

¹ By the way, Česnik (Chesnick) is a Jewish name; and sheds light on part of why those of us who are Jewish Christians deal with our own hardships in be Christians: because we have to deal with: 

1) Pseudo-Christian rot like Father Maskell, regardless of whether they know of our heritage. 
2) The Pseudo-Christian rot that affected our ancestors to become Anusim and/or hide their heritage even if they really believed in Jesus as Mashiach. As a descendant of a Légrádi, I sympathize with the Cesniks.