If you hit the ground, you will probably die; if you get hit by a SAM or AAA, you probably won't.
Absolutely. Which is why the Marine Hornets, led by a very experienced Vietnam Vet, were expressly forbidden from operating (and grounded when caught) at low-level for the opening stages of GW1.
Very sensible leadership from the school of hard knocks...which ISTR was followed by the Jags once shooting began.
Messing about below 50ft in fast jets is largely peacetime entertainment for the terminally bored and under-aroused, though one shouldn't totally exclude its fleeting use for presence purposes in a suitably permissive environment. It worked well in Iraq and Afghanistan on more than one occasion.