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if you think posh bikes are actually worth stealing and you're willing to throw a machete around in broad daylight for them, then go a fucking empty one of those boutique bike shops!
I don't think you're being entirely serious but bike shops have CCTV, alarm systems, staff who could raise the alarm while you were intimidating other staff, customers who might walk in mid-robbery complicating things, passers by who might call the police, mechanics who fancy their chances (I've got quite a few friends who are mechanics and I'm not saying they'd take on someone waving a machete around but they would definitely be much less of a pushover than your average desk jockey MAMIL on their own, outside, in lycra)...
Not when it's on someone's arm.
And again, if you think posh bikes are actually worth stealing and you're willing to throw a machete around in broad daylight for them, then go a fucking empty one of those boutique bike shops! Walk into Sigma Sport with a balaclava on and wave a machete around and walk out with a van load of bikes.
Like I said, there's a tonne of other, better options than crashing into the thing you're stealing, in broad daylight.