and the reason is that it sounds cool.

suicide hubs are perfectly safe to use provided you do your loctite job properly and use quality components. that means: make sure your hub threads are clean, clean, clean and degreased 'til they're squeaky, use lots of loctite, and chainwhip a good cog on securely... and wait for it to dry before riding.

do it right and 'suicide' hubs are perfectly safe.