I'm really sorry to hear about that :( I somewhat understand that feeling. I know a lot of people roll their eyes when I bring it up, but I've felt really guilty about the way my dog and bunny died. I feel like I should've done more/done things far differently. Obviously doesn't compare to a mother (well, maybe my dog, Tachi, since he and I had the closest relationship I've ever had in my entire life) but the guilt is real and it eats away at you. Makes me feel like an absolute fool and a complete jackass for these mistakes. They're hard to move past.
Oh god, Tumblr. It's filled with crazy, entitled morons who love to backstab and be two-faced. Consider yourself lucky in that regard. Tumblr is trash and constantly coming out with the most bizarre and hypocritical politics you'll ever see.