I'm also going to chime in and agree with the OP that this sounds crazy.
I have pushed many, many 3 yos in swings. And many times they have gotten distracted and let go mid-swing. My dh used to push our kids as high as our swingset would allow, which is probably about 8-10 feet, until my ds1, who was 4.5 at the time, let go mid-air. Luckily, he was just very bruised and scratched, and dh stopped doing it.
Maybe you can look at your dynamic of being overly cautious, attempt to be more trusting of your dh, honor his need to be less protective than his own father, and then tell him that you are not going to budge on the swing, and that you're ready to cut it down.
I have pushed many, many 3 yos in swings. And many times they have gotten distracted and let go mid-swing. My dh used to push our kids as high as our swingset would allow, which is probably about 8-10 feet, until my ds1, who was 4.5 at the time, let go mid-air. Luckily, he was just very bruised and scratched, and dh stopped doing it.
Maybe you can look at your dynamic of being overly cautious, attempt to be more trusting of your dh, honor his need to be less protective than his own father, and then tell him that you are not going to budge on the swing, and that you're ready to cut it down.







His name was Gregory Denisowski and you can google him to show your dh the story...a 12 foot fall is not that different from an 18 foot fall, IMO)



Especially the bolded.