Nah it's not his fault fam, partly or indirectly. Difference with Grohl is experience, mosh pits and dangerous crowds came with the territory since his Nirvana days, that was the culture of grunge concerts. This is very rare at rap shows, this is the first time Travis had to deal with anything like this. I'm sure going forward he'll definitely be more conscious of what's happening.
You go to a concert to wild out, this aint an opera show where everyone is seated prim and proper and no one says anything but claps.