Jesus says a number of frightening things. There will be division – father against son. To whom much is given, much will be required. You’re just as bad as those who were killed by Pilate (or by a falling tower). This is all quite shocking, but the disciples need this wake-up call.
People are scared or even offended by Jesus’s power. He keeps who He is a secret, while doing things that, in retrospect, will make it obvious. This is all part of preparing his disciples for what’s coming. Some of the events are actually clever exercises for them.