what twisted reality do you live in where lowering taxes is a bad thing?
- if you run even remotely successful business, getting your tax rate halved could very easily mean $1000s if not $10s of thousands per year of free extra $$
- if you have any investments, they automatically will earn you more, and at the same time will become worth more... I'll simplify a bit, but currently you get 65c for every $1 your investment earns (because of 35% tax rate), if tax rate becomes 15% you would get 85c for ever $1... so you will earn 30% more from your investments and as a result your investment would also become 30% more valuable...
so if you for example have $100k saved up for your retirement, cutting tax rate would mean your investment becomes worth $130k... and so if he makes it happen it would mean uncle Trump just gave you a $30k gift...