This is somehow tempting, I won't deny that there will be an urge for me to transfer all the funds to a different address just for "safekeeping"  .  Anyway, it is a good idea to send a dollar's worth to alarm the owner that his Bitcoin is compromised and at the same time report it, if ever after a year of no response happens, following what Loyce stated, it is legally ok to claim the amount in that key.  It is somehow unethical but not illegal due to the process is taken into consideration.

Sending it to charity when you have a need by yourself... sounds too good to be true, honestly. ... but it would be great if it is actually done.