Why did the boomtown rats sing idont like mondays?

The song "I Don't Like Mondays" by The Boomtown Rats was inspired by a school shooting that occurred in San Diego, California, on January 29, 1979. Brenda Ann Spencer, a 16-year-old student, opened fire from her home, killing two people and injuring nine others before surrendering to police. When asked why she had committed the shootings, Spencer reportedly told police, "I don't like Mondays. This livens up the day."

The Boomtown Rats' lead singer, Bob Geldof, was deeply affected by the tragedy and wrote "I Don't Like Mondays" as a response to the senseless violence. The song, which reached number one in several countries, became an anthem for the anti-gun violence movement and helped raise awareness of the issue of school shootings.