Personally, I feel that if you look hard enough, or spend enough time focusing on the little things one team is getting away with, it is easy to go blind to the fact that it happens to everyone, more or less. Not just Liverpool.
I have seen City win penalties in a similar fashion to how Mane won our penalties against Leicester and Spurs, but they're quickly forgotten, whilst Mane's "engineered dives" against Leicester and Spurs are still talked about and scrutinised months later, for example. People are absolutely up in arms about Robertson's tackle, but Sterling's cheeky stamp on VVD has been completely forgotten about (someone even said to me earlier on here that they don't remember it, which says it all). If you put all your focus and energy into trying to spot the things we have "gotten away with", then of course it will seem like we are getting away with more than the other teams who you turn a blind eye to when the same things happen for them.
I also feel that the vast majority of the decisions that people are getting angry about come across as clutching at straws. Like saying Henderson handballed it against Spurs when really, it was near enough impossible to tell in any of the replays, or like constantly referring to the fact VVD may have handled it in the build up to our goal against Wolves (I think it was Wolves?) when, again, it was very difficult to conclude that he had actually handled it, and on top of that, it was explained that even if he did accidentally handle it, according to the rules, it still would have stood, due to it not being handled by the scorer or the creator. I feel like a lot of our "dodgy" decisions have actually been explained perfectly clearly to be correct decisions, but many people refuse to accept this and instead, it is all a part of some big, elaborate conspiracy, which does not make any sense at all, when you look at the number of things that have actually gone against us, as I mentioned before.
Edit: When it goes even further than that, and people start saying things like Liverpool will get decisions against them now to give the appearance of things evening up, or that opposition goalkeepers are all in on this big, elaborate conspiracy to ensure Liverpool win the League, then it starts to really get mind-bogglingly surreal to read and approaches flat-earther territory.
Edit 2: But that's football fandom, for you. I distinctly remember being the same about Fergie's United teams and Howard Webb!
Edit 3: It happens every season, for the leaders/winners, although the reasons/narrative varies.
Liverpool this season? VAR
City winning the last 2 PLs? Oil money
Chelsea winning the League in 2016/17? Nothing without Costa's cheating
Leciester winning it in 2015/16? Everyone else was bad
There's always something, you can't get away from it. Rival fans will always blame a rival's dominance/trophy win on something other than the fact that actually, they are quite good.