FADBOY
For years, there was no security system on an Harley-Davidson models other than the biggest toughest padlock you could buy or chains and padlocks, junkyard dogs and guns. All of the FL models that had the ignition switch on the dash were essentially keyless ignition as once you unlocked the switch on the dash, you didn't need a key to start the bike. The FX and XL models required you to put a key in the switch and turn on the ignition to start the bike. So you only need to look back to the not so distant past to see how easy it is to deal with your issue. Buy a disc lock or a padlock that uses a barrel key. Even the biggest Master Lock can be popped open with a can of Freon and a hammer. Lock your bike up with what gives you comfort, pay your insurance premiums and you've done all you can. A determined (professional) thief can steal anything. The most popular current mode of theft is a tow truck with a boom and a sling. The thieves run a sling around the engine/frame, pick up the entire bike with the boom and drive off. Takes about 20 seconds. Very close by they have a big box type truck they load the bikes into with guys who disarm the security and by the time you've got the Coppers looking for the bike, it's out of sight. You cannot stop dishonest wankers from doing what they do, you can only stop the occasional mostly honest bloke maybe with a few pints o bitter in im from being an idiot
B B