Regardless of what you think of this, one has to conclude that it's rather ludicrous that the president of the United States of America has the power to give these federal pardons. You are just begging the presidents of America to abuse this power before they leave office.
From the
article on "Federal pardons in the United States" on Wikipedia:
"The pardon power is considered "plenary" and thus generally cannot be restricted or modified by Congress or the judiciary.[4][7] In Ex parte Garland (1867), the U.S. Supreme Court confirmed the "unlimited" nature of federal pardons (except for impeachment related crimes) and broadened its scope to include offenses for which legal proceedings have not been initiated. Pardons have been used for presumptive cases, most notably when President Gerald Ford pardoned Richard Nixon over any possible crimes connected with the Watergate scandal;[8] the legal effect of such "open pardons" has not been determined by the judiciary.[9][2]"
Apparently those pardoned by the president does not even have to be charged with anything at the date of the pardon, let alone convicted. I would assume that most would consider these kinds of "preemptive pardons" to be ridiculous, no matter who signs them while in office (?).