Or, if something is 'human nature' but can 'go both ways':
It's either a truism, meaningless or inaccurate.
Or, if 'human nature' offers the reduction of a very complex problem - as racism always is - into quite an easy answer, and discourages or prevents us from probing further as to what socio-historical factors may determine such culturally significant feelings such as racism:
It's either a truism, meaningless or inaccurate.