I am 100% sure about my dh and his past behavior and while I cannot predict anything future wise with 100% certainty this is not an issue I am concerned about. But I can’t say the above with 100% certainty about anyone besides my DH and my immediate family
When we had kids, we learned that there is a big gap between having unconditional love for someone and having complete confidence that they have never or will never lie, disappoint, do drugs, take unnecessary risk, etc. It is humbling. I love all my kids and each has a great moral compass -- but they are not robots programmed by me to please me or live up to my standards.
And when it comes to leaving your very young kids with the people you have trusted the most in your entire life, there is still that tiny voice in your head that says "But I don't really know this unfailingly reliable person in this exact situation...and the stakes are so high..."
I don't have 100% confidence in anyone and I don't think my spouse does either. Then again, we generally don't need it.
And I am 100% certain of my past behavior because honestly 20 years feels like yesterday to me.
You really have eidetic memory for your lifetime of words and deeds? You must win every argument.