To delete a plug-in on the Mac, you need to access the User Library library folder.
Open File Finder on your Mac.
At the top of the screen you will see drop down menus.
One of these says Go. Click the Go menu to see it drop down.
Then hold the Option key on your keyboard and note that the word Library appears in the Go menu list.
Choose Library → Application Support → McNeel → 7.0 (or your version) → Plug-ins. /Users/<login name>/Library/Application Support/McNeel/Rhinoceros/7.0/Plug-ins
Delete the plug-in file from here (Twimmotion, Datasmith or whatever plug-in that you have loaded. You can delete it to uninstall, rename or move it to keep it from loading.)
Report your crashing to the offending plug-in developer.