I have a 7y DD in school, and I also work as a TA in a Y1 class.
Of course teachers should be touching children, appropriately of course (does that even need adding???)
As a TA I often have teary children sat on my knee, Y1/2 children giving me hugs if they see me in the play ground, a ruffle of hair as I pass, a guiding hand on a shoulder or back, etc. It is part of my job surely.
I would be upset if my DD's teachers were unable to comfort her or give her a reassuring pat.
TBH even when I taught in secondary (was a teacher) I touched my students - again, if upset, a pat on the shoulder, etc.
Only place I have worked in a no touch zone was in a male prison - and that was for security reasons. It still felt odd, not even being able to shake a hand.