1. There are tens of thousands of folks who dedicate their lives to protecting the US, who go periodically go through faintly rigorous background checks and state of the art training, who take lower pay, who can’t talk about their work even to defend themselves.
2. There are many different types of information these intelligence professionals following very strict legal guidelines collect and analyze l, cross check, verify, and report. They work countless hours sometimes in isolation to provide the best assessments for the president.
3. Sometimes they get it wrong, sometimes they get compromised, but there are safeguards and various other mechanisms to help ensure these factors are accounted for in the final products presented to the president.