The phrase "hasty conclusions" means making quick judgments or decisions without considering all the information or thinking carefully about the situation. Full definition
Among the rush to hasty conclusions following the Europa League debacle there has been earnest debate about formations. (westhamway.net)
She said the lack of knowledge on the part of anti-graft crusaders about the processes involved in conducting a service inquiry is what is leading them to make hasty conclusions. (ghanapoliticsonline.com)