You aren't pushing to cut him off from parenting time, you are just trying to put safeguards in place so the children WON'T be in imminent danger--by the time the danger is imminent, it's likely to be too late. The fact that he is drinking while they are in his care makes the risk unacceptably high that they will be endangered. Yes, things like an undocumented "visit" to the ER, missed school days, are very significant in that regard.