Forming an opinion directly from a headline is one of the more common shortcuts a busy reader takes, and also one of the more reliable ways to end up holding a view the full article would not actually support once its details, caveats, and context are properly read through.
Headlines are written to be brief and attention-grabbing, which means nuance is frequently the first casualty, a qualified claim becomes an absolute one, a single example becomes a general trend, simply because the shorter, more dramatic version reads better in a limited number of characters.
The habit worth building is a short pause: read the first few paragraphs before deciding what to think, since that is usually where the genuine substance, and any important qualification, actually sits, well beneath the version of the story that made it into the headline. It is a quiet kind of work, rarely noticed until its absence is suddenly felt.