I think I'm IANBU but DH doesn't agree. We live in a mid-terrace with a small enclosed back garden which abut another row of terraces along the back with enclosed gardens. The only way to get into our garden is to go through our house or climb into our neighbours gardens and then climb the tall fences on all 3 sides. We have a shed in our garden where we keep our bikes, the shed has a lock. The shed is only 2 years old so it's very robust.
DH and I have an ongoing feud about whether our bikes need to also be locked with a U-lock when they're in the shed, behind a locked door. I say no and don't lock my bike up in the shed, mostly because it's just one more faff in the morning to get the damn thing out and through the house when I'm in a rush. DH locks his bike to the shelving in the shed and usually locks DS's bike too. Fine with me, his bike, his rules and DS doesn't use his daily.
This morning, I come out to find my bike locked up separately which DH said was because that was what 'normal' people would do in order for it not to get stolen. He mistakenly gave me the wrong key to open the lock (he has a thing for locks, we've got dozens) and had a paddy when I came back in to tell him it didn't fit as he insisted he gave me the correct key. He was slightly chastened when he went out and discovered that no, I'm not a complete moron and can tell when a key most certainly doesn't fit. He apologised for the paddy.
I've told him many times not to lock up my bike as 1) it delays me and stresses me out in the mornings before work 2) it IS locked already and 3) Anyone who is so desperate to climb over 2 tall fences with 6 houses overlooking, break into our shed and then carry the 7 year old granny bikes back over the 2 tall fences are welcome to them.
Tell me that I'm not BU, would you lock your bike in this situation?