Yes, I'm scared, but not for my own physical safety. Kids squaring up to me is still rare and in 20 years of teaching I have (thankfully) not been hurt yet.
I am scared for my children, especially the youngest, who is yet to experience secondary school. My teenager got bullied for being a nice child who engaged in learning and my little one will likely be the same, but with them it's likely they will cease to engage in learning to fit in with others as they are much more easily led.
I am scared that my male child will experience violence; it's statistically a lot more likely. With both, I am scared of the world they are entering when so many of their peers have had no boundaries. I see the number of fights, the number of children who dish out casual violence (hitting each other over the head with books is common), the number of children involved in verbal abuse and that does make me scared to what he is and will be exposed to.
I am also scared of children knowing where I live (I am reasonably close to my workplace). An ex colleague had a number of experiences with harassment, house egging and attempted burglary once kids found out where they lived.
I am scared of false allegations. They are becoming more common, as are petty complaints about things we say which displease the children as in my school there seems to be a culture of children reporting their teachers to safeguarding all the time over tiny things.
I am scared for the future of this country on a wider scale. I see this year's Y11, conscious they will be released into the world soon and so many of them have few social skills but a huge amount of arrogance, the likes of which I haven't seen on this scale in my years of teaching. I see how unprepared they are for the world of work, for the harshness of real life and I wonder how many of them will turn to petty crime once they realise they are currently unemployable. Schools have failed them by not showing them that their actions have consequences and many will be in a sink-or-swim situation. I wonder how many will sink.