Despite the acting director of the Secret Service reassuring the public that his agency is capable of providing adequate protection to Trump and other high-profile Americans, the details of this report paint a different picture. The swath of people to blame is so wide, it's probably time for a major turnover and injection of more competent staff, who will ensure nothing like the Butler shooting ever happens again.
The Secret Service doesn't need an overhaul in personnel, it needs to adjust its approach to protection from a reactive model to one that's better prepared ahead of time to prevent incidents like this from taking place. Trump's security has been increased, and further changes will be introduced to the Secret Service's strategies and processes.
There's a 28% chance that the next assassination of a sitting US President will occur after January 1, 2100, according to the Metaculus prediction community.