I consider it part of being neighbourly to lend cheaper tools even if the odd item is misused or lost. Best to "play it safe" in case of ever needing a favour from them.
Many on these forums prepare in relatively elaborate and expensive ways for various sorts of doom, indeed discussion of such preps is arguably the main purpose of these forums.
IMHO, a vital and sometimes neglected part of such preps is to be on good terms with neighbours whose assistance you may need in an emergency.
In my view it is foolish to spend perhaps thousands of £/$ on supplies and equipment and yet to risk being on poor terms with a neighbour for want of lending them a £10 tool.

I am rather more reluctant to lend anything expensive or that requires special care in its use, or that is particularly dangerous if not used correctly.

Things to lend readily, screwdrivers, hammer, pliers, wire cutters, basic flashlight, mole grips, hex keys, spanners, cheap hacksaw or bow saw, extension cord, garden hose, and similar items that are cheap to replace and/or not easily broken.

Things not normally lent, power tools, axe, chainsaw, anything that needs special care in use, anything no longer manufactured and therefore not readily replaced, anything expensive.
I would also be very reluctant to lend anything specifically "doom prep related" since I believe in keeping such matters private.