CLEAN : Killing of French priest resonates in Poland at World Youth Day

The transcript discusses the importance of praying for mercy for those involved in terrible acts and reflects on the personal suffering and impact of hearing about killings, especially of priests. It mentions various names and attacks, highlighting the chaos and violence, and concludes with cultural references and a location mention.

What specific event is the speaker referring to when mentioning 'horrible things'?

What is the significance of the names mentioned by the speaker?