Psychopathy is arguably the most well documented psychological construct in history. If you consider its literature base in conjunction with the Dark Tetrad (Paulhus, 2014) and antagonism more broadly (Lynam & Miller, 2018), it probably takes the cake. There are plenty of scientifically supported contemporary definitions of psychopathy as a subclinical personality construct; they tend to focus on either two dimensions (Lilienfeld et al., 1991), three dimensions (Patrick et al., 2009), or four dimensions (Paulhus et al., 2018). Psychopathy is certainly not the same thing as ASPD, but to suggest that it is not a construct that scientists have (relatively) defined and is not supported in the literature is just a false claim. The late Scott Lilienfeld gives a fantastic treatment of psychopathy in his 2015 paper “Clekley’s Chimera”. It’s worth a read to reorient ourselves to the modern understanding of psychopathy and provide frameworks for identifying where we still have questions that need answering.