There is at least one poster here who has had bad CATSA experiences, but looking at all the airports you list you should honestly not have to worry much at all.

Many of the reviews here of more 'intimate' touching at FRA are from a few years ago, and more importantly appear to be often due to the extra screening 'requested' by the TSA on US carriers on US bound flights.

MUC is one of the most friendly and 'easy' airport security I encounter. Both MUC and FRA have workers who speak English well. I have never encountered a malicious female screener in Germany, unlike in the US where TSA seems to hire women with attitude issues (and a LTSO has told us here about the problems TSA faces with hiring and retaining female screeners) Last summer I made a game of counting the number of 'please' and 'thank you's' and other pleasantries I received at MUC during the busy summer season from screeners. Even during the extra busy December freak snow storms they remained friendly and pleasant and lines were short compared to the US lines.

I cannot recall the last time I had a physical pat down at a German airport (I usually use MUC, FRA, TXL, and DUS)

FCO (Rome) is generally uneventful.

I have also seen times where one child member of a family received an extra screening arrow on the CATSA randomizer mat, and the staffer let a parent opt to do the extra screening instead of the child. (I don't know if that qualifies as 'random' at that point, but it certainly qualifies to me as 'empathetic' and 'human'.)