Napoli shouldn't be worried about just having this loss, things happen and as long as they can recover from this then there won't be too much of a problem and they should be handling it without much problem. I understand that it may look like it's a bigger deal, but in reality it is not really that much of a big deal at all, we need to remember how this could be a very normal situation without a doubt.
So, I believe we are overreacting whenever we are saying this could be normal, and we should just move on with this without much issues. I believe Napoli will have a shot at the title, this loss won't be the thing that makes them lose it, they will still have a chance to win it no matter what happened in this game.
It was disappointing result for Napoli and they deserved to feel bad and be worried because they lost a very crucial point when it mattered most, losing at home to Lazio is really poor for a title contender team, they should have done better but then that is football. Napoli have lost their first spot but they are still much in the race despite the loss and they are even likely to drop to 4th place if Inter and Fiorentina win their outstanding matches but the gap is not that much. They should use the experience and learn from their mistakes so they don’t drop points unnecessarily if they want to challenge for the title.
They are doing well compared to last season and they still have every chance of competing and winning the title despite dropping points, other teams will drop points as well as the league progresses so there is no need to panic at all.