"Hard to show evidence" isn't a hall pass for everyone's unmotivated guesses. Could you imagine how slowly science would progress if every time a question was discovered to be hard, the journals filled with everyone's preconceived notions? If in the deluge of opinion someone tried to publish a shred of relatively inconsequential evidence, nobody would notice it amidst the grand narratives, and the shreds would never have a chance to be assembled in to the real truth.