Earlier quoted context omitted.
MANPADs can't even shoot at a jet because they're flying too high. There's only so much rocket propellant you can put onto a shoulder-mounted device that humans have to carry around. If you're only guarded by MANPADs, then a traditional bomber will blast your position repeatedly. The MANPADs are really there to deal with low-flying aircraft (A10 and Helicopters). EDIT: I guess the AC-130 cruises at high speeds, but s…
But you have to fly low to avoid the area SAM defense. Stuff like the Patriot doesn't stop enemy aircraft, it forces them down low where MANPADs and even guns are useful.
Just looking at the wild weasel causes the RADAR system to possibly be bombed. SAM installations vs Wild Weasel tactics are very complex.
In any case...if your SAM is too scared to engage with the wild weasel, they just bomb you from 12,000 feet altitudes.
Winning at 12,000 feet altitudes 50 miles away is the point of the US Air Force. Their goal is to never even engage at lower altitudes until they know they have won in the standoff, long range game.