It’s totally sustainable and sensible to keep on in the back of your head- it’s not like it takes a lot of time.
At playgroups I could always see him (normal, sustainable behaviour)
My son went to nursery at 3 1/2- I chose one with high staff to children ratio so there is no need for an adult to be alone with children except for occasional times.
I chose a nursery where there were only women employed and no parent helpers or volunteers at any time.
I kept an eye on him for changes in behaviour/not wanting to go to nursery/changes in his mood. (Normal and sustainable).
He went to school- one with a female head and female teachers- not that that is a sure fire way to avoid anything but statistically it’s safer. I made sure their safeguarding policy was good and their knowledge was up to date when we talked to them( I presume everyone researches schools before they choose one- normal and sustainable). I continued to keep an eye on my child’s behaviour and demeanour etc, like all parents do.
He goes to hobbies and lessons- they either have cctv playing in the waiting room so everyone can see the lesson happening or I stick my head round the door semi regularly (enough that the adults know I’m there and it’s a deterrent because they might be seen at any time)- this takes a few minutes a few times a week.
I leave my son with my dad, his own dad, my wife, my mum, my sister, my best friends (up to a point- he hasn’t had a sleepover with anyone except my parents, and one is planned with my sister)- he isn’t short of relationships with other adults, he just doesn’t need to be left with them.
He has been on school trips, just not residential ones (he wouldn’t want to go anyway).
Im actually a really really laid back parent, he runs pretty wild-
I have no problem with climbing trees, swimming in open water, climbing cliffs, hanging upside down off high things, eating edible plants he finds, staying up late, walking around the park or moors without shoes, using tools, making food, he has 100% control over his diet and a million other things that parents get anxious about…. If he wants something in a shop he askes for himself, he negotiates his homework assignments with his tutors on his own, he deals with friendship conflicts on his own (unless someone is being violent of something), he has near complete control over his learning process (he is home educated now).
An amount of benign neglect is good for children to build confidence and know themselves and their strengths and limitations - but it is beyond a 9 year olds capacity to deal with sexual predators, so I am vigilant for him.