This is true, the power of incumbency is always underrated.
I think this is why you're seeing him push for a quick restart and why a lot of governors from the other party (Newsom, Murphy, Pritzker, Cuomo, Whitmer) are showing signs of resisting that. They're going to hide behind "public health," play politics and delay re-opening as long as they possibly can because they know opening up will help Trump.
If we come out of this too soon, we will be forced to do this all over again. That will cause more death and more economic hurt than necessary.
I get the cynicism, but could just as easily argue that Trump and some conservative politicians will want to come out of this too quickly to help Trump in the short term disregarding of the additional death and economic toll in the future. I'd even argue coming out too soon will hurt Trump if we see this start to come back before the election.
Lets just focus on getting this correct now and err on the side of caution. I would happily take another 4 years of Trump over getting this wrong... and I absolutely hate Trump.