You are 100% correct. I work in a jail and while there are plenty of people that come through that fit the stereotype for what ever crime they are charged with, there are plenty of folks that you probably wouldn't look at twice if they were in a movie line with you.
We had a young man (19 y.o.) brought in for 1st degree murder (hired hit) that fits the exact description of the guy you in jury for. Most congenial prisoner that was there all week too.
One thing I learned is that it is more often behavior that raises a red flag than looks.
There are basically two kinds of people in this world. Those that believe in the Moon Landing and those that don't.