I'm an assassin but I've lost my memory!

Agreed; ironically, the reward for your newly found altruism would be a very long prison sentence. On the other hand, since you were an assassin, it would be well deserved karma.

Are you saying placing a bomb is only a crime if it blows up and damages things/kills people?

If someone makes a bomb with the intent to damage property and/or kill people but but it fails to go off they are in the clear?

You said “the crime was completed.” I asked you what crime you were referring to. This isn’t a debate thread.

I am not a lawyer or police officer but I would be shocked if you told me setting a bomb was legal (not a crime) as long as it does not go off.

Are you suggesting that manufacturing a bomb and placing it is ok legally? As long as it does not go off then the bomb maker and person who placed it somewhere are in the clear?

Just possessing the bomb is probably a crime, as it would be a “destructive device”. Having one without registering it is a crime, and registering it kind of defeats the purpose of an assassin building their own bomb.

Here is an example of a statute that makes mere possession of a bomb a crime. It is a more serous crime if it does damage.

https://www.flsenate.gov/Laws/Statutes/2022/790.161

So, in the OP’s hypothetical, notifying the cops of your planted bomb may help mitigate that potential criminal liability, but it wouldn’t absolve you completely.

I believe this as well.