How to make your bike unattractive to thieves?

That's so sad! I hate seeing bikes like this, where someone has basically jumped on or kicked in the front wheel. Why do people do this? Are they pissed and mistakenly think it's 'funny' when showing off to their mates? Or are they just total morons without a life and a cock the size of a peanut?

I think that one has had an interaction with a car/van/bus If it was just the wheel I'd think "attempted theft, they couldn't get it, so wrecked it". But bars are heavily bent too, would make sense that its been hit/pushed by a car.

As for making your bike look unappealing, just go crazy with duck/electrical tape, give a 5yr old a paintbrush and access to the 'shed of many random paints', add rust, either by leaving it out, or stripping it and rubbing in vinger.
Or just have a shit bike in the first place, like a £50 argo's bike.

But you just can't beat having the right locks for the job.