I had a disgruntled ex-customer show up at my place when a startup went under. It wasn’t violent but certainly felt like it could have been. You don’t need to be working on secret deadly software for powerful entities.
In the judicial situation, you have a specific unstable/desperate person focusing their anger at Judge X. A judge is a symbol of the state, control, and of a specific matter.
The person doesn't accept responsibility for his actions and holds Judge X specifically accountable for his loss of freedom/income/family/etc. In this modern world, you add on the dimension of unstable politically motived disturbed individuals goaded on by various means. We're fortunate as a society in that disturbed people tend to be disorganized and ineffective, but I think that things are changing that make some of these individuals more dangerous.
I’m sure judges and politicians are at higher risk of retribution, no doubt about it. I only argue we’re not immune as engineers and tech founders. Someone who’s deeply disturbed can direct their blame on anyone remotely involved in their life.