Questioning a possible pedigree is different than attempting to destroy a possible pedigree on this and other internet websites for personal reasons. Destroying years of work in a few days, especially by an individual who might have a vendetta or a personal dislike for a family is, I would think, unthinkable and unacceptable. Why this was allowed, I will still question.
We all realize papers of birth records are sometimes lost or destroyed for various reasons, including, but not limited to politics, religion, peer pressure, fire, flooding, migration and war. Examples, John Hamilton (Church of Scotland) possible son of James Hamilton, 1st Earl of Abercorn (a Protestant of the Church of Scotland whose wife was Catholic and whose children were going to be converted to the Catholic faith after his death) and Alexander Hamilton Captain (Covenanter) (a Scottish Covenanter who supported the Presbyterian Church of Scotland) possible son of Sir George Hamilton of Donalong (a Catholic).
The Scottish exit from the Catholic Church of Rome occurred in 1560, Glasgow Cathedral worship, ministry, and governance changed permanently in line with Reformation principles. The Church of Scotland is the national church in Scotland now. James Hamilton IV Duke of Châtellerault and 2nd Earl of Arran eventually changed his allegiance from the Catholics to the Protestants. There were many other conflicts during this time and records were possibly lost or destroyed.
Even the family of the of the person who made the deletions on this website had ancestors who had changes in their lives after this period. The family of William Ford, Gamekeeper in Hamilton had lived in East Gordon, in Gordon parish, Berwickshire, Scotland (bordering the north boundary of England), but later moved to Hamilton, Lanarkshire, Scotland William Ford, Gamekeeper in Hamilton. And with one ancestor being buried in 1847 at the Old Parish Church, Hamilton, Lanarkshire, Scotland (of the Church of Scotland (William Ford, Gamekeeper and Forester).
The situation would likely be different if the person had at least found one little piece of new information to aid in identifying alternatives to the parents that he had eliminated.