Why are my parents like this?

I (17f) have been struggling with going to school when I found out that one of my peers threatened to shoot up the school. The school did an “investigation” and determined he wasn’t an actual threat. Today I had a bad feeling and didn’t go to school, just something felt off. Turns out the same kid actually brought a gun to school. The police were called and he was arrested. My parents are more concerned about the fact that I missed school instead of the fact that I could have been shot and killed today. I’m glad I listened to my gut. I just wish my parents understood that. They knew I had concerns since the kid threatened to shoot up the school and thought I was overreacting. It’s just why are they mad that I missed school instead of the fact that I could have been killed today? I’m pretty shaken up right now.

Update: my dad is going to call the school about it. I personally think it’s too late for that. I’ve been avoiding my family and I honestly think this has ruined our relationship for the foreseeable future. I had a conversation with my mom and I ended up crying. I haven’t talked to my dad and honestly I don’t think I want to for a while. I have a therapy appointment next week; it’s going to be very very needed. My parents want a united family but I think that’s not going to happen anymore. I already know that I’m being kicked out the day after I turn 18 so I’m going to try and prepare and figure things out before then so I’m not homeless.