I think youre mixing up agressivity with playing loose.
Agressive plays are the ones that you activelly attack the pot and bet. Its a good strategy because even when youre outflopped, you can controll the pot size, and when you have the best hand you can extract value.
Playing loose is when you broaden your range and play
hands that tight players would not.
There are a such thing as a tight agressive player, that is a player that only plays premium hands but activelly attacks the pot.
So yeah, agressive is good!!!