Incompetence lies in not checking these things as they leave the factory, orcare loaded forvshipment to the front. With bad reputations for this sort of crap in the Russian military supply logistics, the Russians just can't figure out how to stop this.
The inspectors are on the take.
FYI, Ukraine has the same problem. Both Ukraine and Russia are preposterously corrupt
Americans are no strangers to corruption. It's hard to be a Trump supporter and not support some forms of corrupt behavior in public officials. There were plenty of examples of corrupt behavior in his administration, and Republican senators couldn't even bring themselves to impeach him for trying to extort Zelensky in return for weapons that had been authorized by Congress for delivery to Ukraine. Democrats have one of their own senators facing charges on corruption for a second time. We just don't see our system as "preposterously corrupt", because corruption doesn't always go unpunished. We are even slowly, and very reluctantly, coming around to the position of making Donald Trump face consequences for his corruption, the most recent example being the New York state judgment to clamp down on his businesses in the state after decades of publicly known scandals going all the way back to his father's financial shenanigans.
I have experienced corruption in action in Russia in the past, and Ukraine certainly suffers from similar endemic corruption. It came as no surprise to me that Russian invaders have stolen just about everything in Ukraine that they could lay their hands on. However, Ukraine has been making progress where Russia has not. In particular, we have the fact that Zelensky was elected in large part because of the expectation that he would do something to end the corruption in high places. And it is undeniable that he has taken some actions to curb it, primarily to assure his foreign allies that their foreign aide will not get siphoned off to enrich people in power who are charged with getting it to troops and others who need it.