Popa
We don’t say it as “proof” we say it because human nature is to be selfish unappreciative and to be egotistical. I spoke to a certain Rebbeh yesterday he told me that to develop real Bitachon takes a lifetime of work and one has to learn the Chovos Halevavos daily. Its so easy to take things for granted. We must make an effort to see Hashem in our everyday lives. Its easy to see Hashem when bad things happen. All bad things are blamed on G-d its the good things that we all take credit for or say “coincidence” “luck” or they happened by “chance” therefore we tell Hashgacha Pratis stories to be mechazeik our Emunah and Betachon and to try and really open our eyes to see that everything good comes from Hashem and that everything is good because everything comes from Hashem.