It's because most "fans" don't actually really know what is a legal/ legit action/call and what isn't. They get caught up in mob mentality behaviour and can't see the wood from the trees.
I'm not defending some of the calls the refs make, they could also use some additional coaching on reffing properly and having two refs (yes, that old argument) would definitely be a bonus.
Until such time as people learn the rules for themselves and make efforts to watch, learn and understand different types of plays, they will continue to shoot down the ref. Mainly also because it makes them feel more important and worthy because they don't have the privilege of being able to do such a thing in their day job. Power tripping...
I'm not defending some of the calls the refs make, they could also use some additional coaching on reffing properly and having two refs (yes, that old argument) would definitely be a bonus.
Until such time as people learn the rules for themselves and make efforts to watch, learn and understand different types of plays, they will continue to shoot down the ref. Mainly also because it makes them feel more important and worthy because they don't have the privilege of being able to do such a thing in their day job. Power tripping...