To me, the Bird says, "Woops! I grabbed the wrong pawn by mistake. Is it too late to say 'J'adoube?'"
Ah, the Bird is quite playable. A bit aggressive for my taste, but certainly playable. The Dutch is quite respectable for black, how can it not be at least playable as white?
If 1. e4 is met by c5 (the Sicilian), yes - you can try 2. d4 (the Smith-Morra) which is dynamic... But, I recommend 2. b4 (a wing gambit) for real untred waters and a fun game -- if you wanna sac a pawn.
I don't think you need to play these gambits in order to play aggressively against the Sicilian.
In the main lines, white obtains an attack anyways + in those gambit lines, if black knows some theory or has home analysis on them, white will get crushed in the endgame. Yea black is forced to defend for a while into perhaps the late middlegame but it is do-able.
I really think white players who play 1.e4 looking for an aggressive game should look into the Open Sicilian. The English Attack Setup against the d6 Sicilians followed by a pawn storm is pretty aggressive. Ive heard that there is a video on this site that explains how to use this setup against various Sicilians.