It wasn't always a norm and there's no reason to assume he isn't an abnormallity which future candidates won't be able to replicate. Even then ... I'll take tax return a thousand times before either lasting impact I brought up.
So far he's been completely ineffectual with regards to policy. Let's see what happens here before we claim we won't recover from his term.
It has been a norm for 40 years, and given that Trump won the presidency without disclosing those tax returns, there's not much reason to suggest this won't be the new normal going forward, either. And I don't just mean specifically in terms of tax returns and conflicts of interest, but the general principle of transparency and accountability around presidential candidates that has now been exposed as being actually totally unnecessary to win.
I mean, yeah comparisons to the Civil War are pretty ridiculous, but I'd say potentially doing a irreparable harm to a decades-long tradition designed to give the electorate more insight into just who they're electing into the White House is a pretty big deal. Of course it remains to be seen whether Trump is an outlier in that regard -- I can just as well see Trump leaving office so unpopular that all future candidates will continue disclosing their tax returns just out of interest of putting daylight between themselves and Trump -- but who knows, right. We're only 120 or so days in, hard to judge what the actual permanent damage will be until long after this administration is over.
Backing out of the Paris Climate Deal leads to more greenhouse gases in the air because of greedy bullshit Trump backing manufacturing companies & agri companies not being forced to buy themselves some new scrubbers or what have you to curtail their emissions.
This, in turn, leads to global temperatures rising further, which leads to more 'wackiness'.
Or, those companies can go out of business because their competitors are saving money in adopting renewables and curbing their CO2 emissions.
Correct me if I'm wrong, but Obama's Clean Power Plan never actually went into effect, right? It has been tied up in courts all this time? So all of the progress made over the last several years in energy efficiency, renewables, emissions reductions, etc. have been predominantly driven by market forces and city/state initiatives, not mandates from D.C.