It's not trash, it's "sausage."
Putting together a $2 trillion stimulus package in a week, designed to get money into consumers' hands and to keep companies from cutting payroll is not easy.
And while of course there is corporate lobbying, the most effective lobbying is constituent lobbying, the guys back in your district who give money to your campaign, go to your church, golf with you and their daughter is getting plowed by your son. When they call you up asking for help, that is more impactful than a CEO (of course, it takes a critical mass of constituents to get a Congressman motivated).
The result is a bill like this becomes a mishmash of policy designed by experts (or in the case of this administration, pseudo-experts), corporate interests, and local interests. And because the timeline is so short, the horse trading is far more intense.
Thing is we're a representative government and our representatives represent local interests first and national interests second.
Always has been that way, always will be.
Key is to have someone like LBJ who understands the art of the political deal - and that it's a repeated game, your reputation is as important as your spine of steel - because lie once to someone's face and you'll never be trusted again. You can be a SOB, but you need to be a reliable SOB.