Why Did Morgoth Take Radically Different Approaches to Men and Elves?

In my recent video on the Tale of Adanel (https://www.youtube.com/watch?v=tcOISb-59rw&pp=ygUTdGFsZSBvZiBhZGFuZWwgZmFsbA%3D%3D) I discussed how Morgoth seems to have taken a very different approach to dealing with Men as compared with Elves, but why would his strategy change?

Other Links:
Playeur (formerly Utreon): https://utreon.com/c/TolkienLorePodcast/
Rumble: https://rumble.com/c/c-355195
Odysee: https://odysee.com/@TolkienLore:f
Twitter: https://twitter.com/jrrtlore
Patreon: https://www.patreon.com/tolkiengeek
Discord server invite link: https://discord.gg/EVKynAj2m9 (If link is expired contact me at [email protected] and I’ll send a fresh invite link).