ICBMs travel about 7km/s, Bezos and Branson both got up to about 1km/s, 1/7th of the speed, and 1/49 the kinetic energy.

ICBMs can be converted to carry a human in a tin-can on top into space, if you happen to find yourself in a space-race.

Do ICBMs have any practical uses besides delivering explosives?

If you can deliver a warhead, chances are you can deliver a satellite.

Some of the space launchers today either started life as an ICBM turned dedicated launch vehicle (Proton) or are decommissioned ICBMs turned launch vehicles (Minotaur)

https://en.wikipedia.org/wiki/Proton_(rocket_family) https://en.wikipedia.org/wiki/Minotaur_(rocket_family)

Makes sense that former-ICBMs that can reach orbital velocity have utility. (Are they still ICBMs if the goal isn't to reach another continent?)

I think the deltaV's needed to place a warhead on the surface are significantly less than those needed to put a satellite into low-earth orbit.

If you can lob your warheads into orbit with enough propellant left to accurately deorbit and aim them, you've then 1) got the capability of dropping them anywhere on the planet you choose, and 2) no longer have them sitting vulnerable in the silos and can sit back and choose your retargeting strategy without worrying about whether all your launch facilities will get nuked before you chose which cities to retaliate on...

There has been somethink kinda like that, just not long term orbit:

https://en.m.wikipedia.org/wiki/Fractional_Orbital_Bombardme...

The other nuclear powers did not like it and it was scrapped. Not to mention that even if you might get the first shot this way, there will almost certainly be retaliatory strikes back on you.

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There were some plans to convert demilitarized R-36 ICBMs to land couple tons emergency supplies (eq. lifeboats, medical stuff, firefighting gear) anywhere 10000 km from the launch site. In the end those rockets were just converted to the Dnepr space launcher.