If there’s a piece of meat which many say is treif, and there are those with teirutzim to say why it’s not treif, you choose a piece of meat with no shailos over the meat which many say is treif. Safeik deoraysa lechumra.
Many gedolim say Chabad the way it is today is avoda zara / apikorsus. Chabad has teirutzim why it’s not, but why not choose a chassidus that doesn’t require teirutzim to not be avoda zara or apikorsus?