To be fair to Boeing, they'd absolutely need to launch that over a large body of water.
Those are 10metre diameter SRBs. I've read upwards of 108 million lbs (480407kN) of thrust on the smaller iterations. That's like setting off not one, but
2 of the atomic weapons that flattened Nagasaki simultaneously at main engine start.
There's no sprinkler system on earth that'd be capable of stopping that thing erasing a land based pad at the Cape.
In fact, I checked to see the damage it'd cause.
View attachment 34068
That's a blast crater the size of pad 39 down to 30 metres.