Because the same folk who have been convinced by a few weeks of goals (some even his most biggest fans have to admit were flukey ie. 2x de gea howlers and 2 defensive mistakes from Chelsea's defenders) were likely the same who no doubt were hoodwinked by Silva following his purple patch of wins against the top 6 last season.
The only thing im guilty of is having high expectations - the day he improves his finishing and scores on a regular basis (and not missing constant one on one's etc.) Is the day he'll have won me over and I'll happily admit to being wrong - but until then he has no right dressing like Tom Davies thinking he has made it.