Mech mods are 100% safe if you know ohms law and battery safety....
I'm sorry but that statement is simply not true. Knowing ohm's law will only prevent you from making a build that is fundamentally unsafe. Knowing battery safety will help you to not do stupid things, but it cannot prevent that. Nor can it prevent simple mechanical failure.
There is only one way to to make a mech 100% safe:
1. Know everything there is to know about all the possible failure modes for your mech. All of them. Even the ones you never heard of. (yes, you have to prove a negative here to get to 100%)
2. Have a plan of action for every possible failure mode identified in #1
I have some fair experience in a certain very life threatening high risk sport. I learned two things from that, as I watched my friends die, one by one:
1. Sh*t happens. I don't care how much you know about that risky subject at hand, you can always be thrown a curve. Accept that you cannot prevent sh*t from happening. And any man made system can, and will, fail. That fundamental failure rate is a game of statistics you cannot beat.
2. On any given day, any given person can, and eventually will, do something very stupid.
When #1 and #2 coincide, in a high risk situation, people die. Fortunately mechs aren't usually *that* dangerous. But the principle is the same, regardless of the absolute levels of risk.
You can make all the same arguments for regulated mods. However, if you developed risk profiles for mechs vs regs, it would be clear that statistics are on the side of regs. And this is purely a game of statistics. Put a million mechs or regs in a million people's hands, and #1 and #2 happening are statistical certainties. As are the resulting accidents.
I went into this because education can minimize risk, but it can never eliminate it when something is inherently risky, as is any incendiary device missing a safety fuse, which is what mechs are all about.
I am not anti-mech. I am just a realist and I think I have a very realistic understanding of basic risk assessment. Anyone that says "this is 100% safe" is deluding themselves. Nothing inherently dangerous can be made 100% safe, ever. Fact of life born out by statistics and time.