That is absolutely not true. An easy example to disprove your argument would be the Japanese attack on Pearl Harbor on December 7th, 1941. The American Navy was caught completely by surprise. At the end of the war, there were some Japanese tried for war crimes, but not for the sneak attack on Pearl Harbor.
If there were an anti-Russian militia that set up shop in America and occasionally attacked Russia and Russia figured out a way to target many members of this militia and a few innocent bystanders were also injured or killed, the rest of the world would say “yeah… that is what you get” and Americans would say “Why are we allowing these armed assholes to set up shop in America and attack Russia?”
I’ll quibble with you on ‘booby trap’. Booby traps are like what Russian is doing in Ukraine when they retreat: putting primed grenades next to doors that will be opened when Ukrainian troops come through. Or maybe later if the Ukrainian troops don’t find the booby traps: civilians who come back to the ‘cleared’ areas. This is why booby trapping is prohibited. The enemy might miss it and later on a civilian might come across it.
The Israelis modified devices meant for military purposes by a para-military organization. These pagers weren’t being sold in local markets to anyone who would buy them.