Not a great argument. Most of Trump's policies like expanding use of coal and not taking actions to prevent flooding and other consequences of global warming will be felt in 10, 20, or maybe even 50 years. By reversing course and burying the facts, he is still responsible for them in a way that Obama (who tried to work on the problem) was not.

Even more directly, Trump is in the process of gutting our healthcare, education, and taxes (read: infrastructure). If he had a few more votes in the Senate, they would have already undermined/removed even more of our social safety net. Millions of people will have significantly worse quality of life and for many of them it will mean the difference between life and death. Their medicines will get too expensive...they won't be able to afford to see a doctor in some cases...or get surgery or chemo in many more.

To say that Trump's policies aren't killing people (and especially Americans) is to ignore anything but soldiers from the count. Obama largely inherited Bush Jr's wars (and Bush Jr. was largely continuing Bush Sr's wars) so you're welcome to blame him for the deaths there but he probably had fewer options than you imply. Not to say he did nothing wrong, but Trump is literally threatening to nuke North Korea which is orders of magnitude different from how Obama acted even once in eight years.