What I do is point out how others oppression can also effect them and the people they care about.
With immigration for example a lot of people don't care that the immigrants don't get any due process before being deported / locked in a concentration camp.
if you can convince them this can also effect them you just might be able to get them to care.
The more people turn away from trump the more effective resistance becomes. We should be encouraging this. Better late than never.