I am very sorry to hear about your experience in Ecuador! I am also very sorry for those two women who had to experience what they unfortunately experienced - that is horrible!
I am also shocked that you had this experience there. I believe it was 2005, we had the opposite experience... However, we decided not to go to the Pinchincha area due to bandit reports and fear for our safety. We instead climbed El Corazon as our acclimatization hike which was a great option.
We also traveled through the city (Quito) day and night and had no issues. But, we were very aware of choosing the safest streets - and as it so appears just got lucky.
I hope your experience is isolated and Ecuador is not going down hill. I had an amazing time there and have nothing but great things to say about the people of Ecuador (especially in the smaller towns - banos in particular)... and fond memories to look back on. Like anywhere though, it is important to head warning and not go into areas that are known for bandit/robbery encounters. We checked with the American Embassy on arrival and read reports of recent robberies and bandit reports before choosing routes in the city and on the mountains...
Be safe out there and I hope that this is not a sign of a changing Ecuador, because it is a remarkable country!