If you like to photograph people you don't know, I do not think that Pentax 67 is an option. I found that strangers generally do not like big SLRs pointing at them.
If having scary subjects better to use an smartphone

I don't see why a pentax scares people more than a hassie... IMO anything that's not a an smartphone may disturb people, and it's the photographer himself that has to behave a bit like a clown to bring attention to him and to provocate smiles or the expression he wants.
For hand held usage (to portrait people) a P67II has an impressive advantage in agility over system cameras like the RZ or the Hassie, even a kid handles a P67II easily, here my (then 8 years old) daughter handling the Pentax, (spot metering before framing) https://www.flickr.com/photos/125592977@N05/46463362194/. For active/dynamic shooting can also do the job but they are way, way less agile than a P67 which plays in another league. Still for a Pros used the Mamiya, the Pentax or the Contax 645 a lot because being all less agile than the P67 they could mount new backs faster that loading film in the P67, still when 220 was available the P67 offered 20 shots in a row...
Also the P67 had very portraiture oriented glass, in particular the 105mm 2.4 has a highly dedicated bokeh, with sphereric aberration being insanely undercorrected in the background defocus, thus providin a bokeh made in heaven.