How are WW1 or WW2 era bombs still regularly found in gardens and houses around UK and Europe?

Question

The day after or week after these were dropped 60-100 years ago, did people not think, there’s a bomb over there we should make it safe.

Edit: I singled out the UK because they discovered a bomb from World War Two today in Plymouth. I know the UK is still in Europe.

In: Other

Answer 1

This just speaks to the ungodly amount of bombs dropped during those wars. People often underestimate it but out of all bombs only a small amount don’t detonate, and out of that small amount most were cleared during the post war, and even as such that tiny minority of bombs that didn’t go off and weren’t found still account for a huge number of such instances.