I had a considerate burgular in the summer on the llangollen. Snipped off the rear padlock, helped himself (or herself) to a few tools, using them to remove the tv and bracket... and worse still my summers supply of beer and wine whiskey and brandy etc even the ones under the seating and not on display which was not sporting. The only thing that made him considerate was the lack of damage to the boat and closing the hatch behind him.
As people have said, if you make the boat harder to break in the damage would be greater. I have toyed with the idea of filling the boat with CO gas when it is left, thus burglar proofing; but that would mean I would get done for murder even though it prevents repeat crime. I would be more tempted to leave a doctored bottle of booze on board, who would know who poisoned the 'uninvited victim'!
This country is far too lenient on theft!!!