A gunman’s attack on four people sleeping on the Blue Line early Monday came during a difficult week on the CTA, highlighting the challenges city and transit officials face in tackling violent crime rates that have remained persistently higher than before the pandemic. The likelihood of being a victim of violent crime on the “L” remained lower through the first six months of 2024 than highs seen in the early years of the COVID-19 pandemic, but a Tribune analysis shows that reported transit crime has stayed stubbornly above pre-pandemic levels.