I think your reasons for using an app are perfectly valid. Going around once you are over a certain age, when single men are not in plentiful supply, joining groups and chatting to random men is not likely to deliver results- as most of these men are coupled up! Same at my work, all my lovely male colleagues are married or in partnerships.
I think apps are then the uneasy compromise as they are awful, but at least there's a 50% chance some of the men on there are single!
What I would advise is to use the Burned Haystacks dating method, I used it, met my lovely partner. Weeds out the quantity of awful men and awful dates and seems to leave you with ok men and then you can take it from there.
In terms of which app, I prefer either Bumble or Hinge, Bumble is the best for me although you do need to block quite heavily if you want to encourage matches from further away. I would rather travel to meet someone great than date in my local area.
As for being negative, I think some of this is natural. The apps are awful, people aren't lying, but having BHDM gave me a way of tackling the awfulness that minimised it a lot.
In terms of being single, I think a lot of women are only just discovering this as a great life choice and seeing it as a viable alternative to coupling up, and norms around this are only just changing- so it's inevitable people are enthused when they find out they don't have to wash socks, pay for or worse put up with the abuse of horrible men. I've always preferred to be single than in a not right partnership, sounds like you do too, so this is a great time to explore the options, but I think it's pretty obvious why many women are extremely against spoiling their peace with a man.
I take it with a pinch of salt though, everyone makes their own choices, and no-one is forcing you to remain single, so I don't see how some women loving that state is affecting you too much.
Do make a proper profile though, with pictures, thoughtful text and then block to burn (BHDM) like there's no tomorrow. Nice men on the apps do not stay on there very long. My lovely single male friend stayed single for about two weeks!