Why is there such a dearth of sincerity in the world?

It takes a lot of time and patience to find someone who is compatible as a potential relationship partner as well as looks attractive.
A lot of people are obvious liars or just not looking for a relationship.
Particularly on the most popular online sites.

Thanks for your input. I already feel online dating is hopeless compared to accidental real life meetings I had in the past. But even they were so few and far between and unfortunately they slipped through my grasp as it were. At least 4/5 times where the feeling was mutual circumstances meant it didn't happen. Now I find the isolation painful and the lack of the right connection.

Online dating is a bit like a maze with lots of pathways leading to a zoo, a circus, casual sex, a muddy pond brimming with very strange little fishies and a quicksand beach.

Offline singles events and professional introductions are always a lot better.
Particularly those organised or sponsored by experienced dating consultancies and matchmaking services.
DinnerDates is a great way for people in their 30s to meet singles who are looking to date, its also a good place to make professional contacts.

I believe in right person wrong time.
Maybe one day there will be a chance to either meet them again in the same room or receive a social media request to chat/video call from them online to say a final goodbye and silence all the 'what if' whispered thoughts that only start on cold lonely nights.
Good luck!