The real problem is that lawyers hold everyone else to a higher standard than they hold themselves.
When you fuck up it's a mistake or a typo. when someone else fucks up is a sign they are incompetent. One of my bosses who is pickiest about typos makes kind of a lot them himself.
Also, I don't think
Because making mistakes about anything suggest that you're mistake-prone and will more likely to make mistakes when they matter.
is all that accurate if you are talking generally. Yea, the guy who makes typos will probably make typos when it matters. But that doesn't mean he can't craft a better argument that the guy who never makes a typo. Everyone has strengths and weaknesses.
The most disgusting part of the whole thing is that big law firms don't hire dedicated proofreaders anymore.