Why would you feel bad for St. Louis? They stole the franchise from the Los Angeles area.
The Rams were not actually in Los Angeles when they left, they were in Orange County and under control of the much hated Georgia Irwin Geiger Johnson Hayes Wyler Rosenbloom Frontiere (yes, Carroll Rosenbloom, the owner of the LA Rams was her SIXTH husband). Georgia was booed so vociferously at Rams games she stopped attending.
The Rams were much beloved and very successful under Rosenbloom and mostly under his son Steve, who was running the team at the time of the elder Rosenbloom suspicious drowning. (Cubans, the Mob, CIA and gambling interests are the ones blamed in the better conspiracy theories).
The first thing mommie dearest did was fire Carroll's son Steve and take over the business she had never had any involvement in.
So no, no one in LA was sorry to see them leave.