I know it's impossible to move faster than light, this is merely hypothetical.
When you move faster than light, you have infinite mass. Now, surely if that thing with infinite mass crashed into anything, wouldn't an infinite force would be produced (F=MA) ?
And wouldn't that force kinda fuck shit up?
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The other way to look at it is that it would take an infinite amount of energy to exceed the speed of light. So to achieve FTL speeds, you'd need to use up all the energy/mass in the universe "and then some," so you'd have (less than nothing) to run into at that point. But yeah, by the math, you'd destroy the universe either way.