I lived in the Soviet Union in 1977, and granted I was 10, and not really aware of the height of intellectualism of security people, my parents did not chat with them about much unless they wanted to know the hours of operation, or where the toilet was. They tended to be nice to me, though, patient with my Russian, and able to talk to me on my level without talking down to me, with the youngest ones being the worst at it-- probably the newest, still on probation, and least likely to be parents.
I never, ever saw any kind of altercation, even a minor one, nothing that provoked violent tactics from guards that were short of drawing guns (like punches, drawing batons, etc.) The most I ever saw were people wandering into an area they weren’t supposed to be, told politely to leave, but gave lip to the guards, and got a harsh verbal command back-- as they were leaving, mind you-- never saw anyone forcefully escorted out.
I’m going to guess that giving the Soviets’ fondness for documenting things, anyone who fired a weapon on duty was going to be subject to a lot of paperwork, and get home late.
Also, FWIW, most working-class Soviets did not necessarily see their children every day. Children younger than high school age were generally cared for by their grandparents, and lived with them. Sometimes 3 generations lived together, but more often the children and grandparents lived further out from the center of a city, where parks and schools were, and parents lived closer to the center, where offices were, or very far out, where factories were.
It’s just how it was, and was totally normal. Most kids lived in the same city as their parents, and saw them every weekend-- some even had dinner with them almost every day, but then they’d go home to sleep, where they’d need quiet, and would get up very early.