Becaue they don't want people like us complaining about activist judges striking down laws that were duly passed and signed into law by our elected representatives?
Question: Once you accept the proposition that the Commerce Clause gives Congress the authority to legislate in any area that arguably has an impact upon interstate commerce (the SCOTUS has taken that position for at least the last 70 years), then why is the Americans with Disability Act unconstitutional? The ADA may be stupid and unwise, but that's not the test for determining whether a law is unconstitutional.
“Once you accept the proposition that the Commerce Clause gives Congress the authority to legislate”
I don’t accept that proposition. But I like tilting at windmills.