Exactly.
It wasn’t ONLY about Flynn, it was about who he was talking to.

Coordinated attack.
The Italian Ambassador unmasked.....think Papadopolous & Mifsud.
Samantha Powers unmasked....think UN votes the Trump team were campaigning on that went against Obama.
Biden unmasked then went to Ukraine a cpl days later....think Manafort.

Also, Flynn’s call to Kislyak we’re late December. These inquiries/Unmasking started way before.

They didn’t have justification to do this.

They were pushing information to different people (ambassadors across the globe) to complete their spy missions. Sometimes this information leaked to the media....felonies.