You could've done it yourself. Why a frontal assault cross the bridges? Why not a sneaky night attack, just swim over the river and take them all out yourself. You could do that, taking out less than a plutoon of soldiers, since you could take out their airforce base and land crawler all by yourself.
But you still had to do everything in the main mission for the BoS. You didn't get a choice of who you could help. There was only one choice, since if you want to complete the game, you can't role play that your character doesn't like the BoS. Or well, you can, but you still gotta help them in everything and Lyons'd be like "oh, you're such a good person for helping us and doing the right cause" and inside your head you think like "[censored] you, I just help you because I have to. In my spare time I blow up nukes in junktowns, leave innocent androids to their evil masters, enslave children and eat humans alive, and I'd rather help the Enclave with their cause (but they won't let me) they are better organized, have a better plan, and then I'm gonna wipe the BoS out (but Bethesda won't let me... untill I get Broken Steel, but I still have to kill the Enclave all over again).
And why is that? Why are we only given one option? Or wait, we are forced one option rather, because if we don't take that option, then we can't finish the game. Why couldn't Bethesda have fleshed out other faction, like actually helping the Enclave (putting that virus in the water barely does anything, and they still shoot at you, and then blowing up the Citadel doesn't help the Enclave either because you still have to kill them and Raven Rock is still gone and all that) or why not joining the Super Mutants like you could in Fallout 1? Why don't the Super Mutants have a leader, either? They, if any, need leadership. I would have liked to talk to a leader similar to Lou... (also, off topic, but why is there nothing about why the mutants are in D.C.? They need more FEV, why can't we go look for it and destroy it/sell it/give it to them? And why can't BoS do anything about the Mutants even if you tell them about where they all spawn from? Would make life soooo much easier for BoS, but would of course make post-end gameplay too boring for the TES fans.)