Because I’ve seen it firsthand Joel. I’ve seen cup and core bullets come unglued and fail to penetrate to the vitals. I’ve seen bonded bullets stop between shoulder and rib cage.
To date I have shot game with Nosler Ballistic Tips (I’ve seen them fail to penetrate), Partitions, Accubonds, Partition Gold, Fail Safes, Speer Hot Cores, Speer boat tails (I’ve seen them fail to penetrate), Grand Slams, Hornady Interlocks (I’ve seen them come apart and fail to penetrate, Interbonds, SST’s, ELDM’s, A-Max, North Forks, A-Frames, Scirroco’s, Hammers, X, TSX, XLC, TTSX, LRX, Scenars, Bergers, and some I’m likely forgetting.
I’ve earned the right to have an opinion on the subject.
Yes they all can work. But there is a big difference between hunting to prove some bullet and proving a bullet by hunting. Unfortunately we see far too much of the former.