I'm sure we all know the answer but don't like to say or admit it to ourselves.
The away support and the home support are entirely different.
One puts in considerable time, money and effort so is totally invested in the club, often going into a hostile environment along with the players.
The other pops along to the entertainment, sits on their hands and leaves early to 'beat the traffic'.
The away support has had many more knocks, this season, at far flung places like Stoke, Plymouth, Watford, but still keep selling out, cheering the players and never, to my knowledge, booed the players off the pitch. Everyone packed into the away section is 'in it together' and that includes the players.
The home crowd get in cheap, take bored kids playing on their phones, whinge about the catering, queue for pints but moan about the quality and are there to be entertained. Those who don't sing and cheer are spread out amongst those who do which dilutes the atmosphere. I usually sit in the East Stand and have actually had people turn round and frown when I've blasted out a big HA'WAY!!! ...
... because the stadium is often quiet the bigmouth moaners, and 'amateur experts', can be easily heard which, again, dilutes the atmosphere.
At Roker Park the crowd would encourage the players, now it's usually the other way round. We didn't need orchestrated singing and pre-match entertainment. An hour before the game the young 'non drinking' lads would get into the centre of the Fulwell and start to wind up the atmosphere. Before the players even came out they'd have heard the noise from the dressing room, then the place would start filling up ... it always seemed full even when it wasn't and people would sing.
The current pre-match music is fine but it actually kills the real atmosphere in my opinion.
I can't wait to cheer the players onto the pitch at Hillsborough. Anyone watching will see what support is, the TV cameras will mention us and the players will come over to the away end at the final whistle. Just imagine if the SOL was always like that.