When an amp clips it does in fact chop the top of the wave form off, however this does not effecetivly place DC across the speakers what it does is effectivly place a virtual square wave across the speakers. A square wave contains a lot of high frequency content which will easily blow your tweeters.
RG
A severely clipped 100 Hz. sinewave, clipped enough to resemble a 100Hz. square wave, will result in less than one watt of clipping harmonics reaching a tweeter through a 2000Hz.
12dB/octave high-pass filter. Probably more like 0.5 watts of treble harmonics.
Far from enough power input to damage a tweeter voice coil.

The more common intermittent clipping of music transients such as bass drum hits or snare drum hits, would add small amounts of treble clipping harmonics intermittently.

Clipped music transients are unlikely to create treble clipping harmonics whose power is more than one watt, and then only intermittently. Any more would drive listeners out of the room. No tweeter voice coil will be damaged from less than one watt of intermittent or even continuous clipping harmonics.

Tweeter voice coils are damaged by too much electricity (treble too loud for too long).
Amplifier clipping adds some treble without one touching the pre-amp volume control,
so it adds to the heat load of the tweeter's voice coil.

However using a much more powerful amplifier that never clips would only allow you to play music roughly 2dB louder for the same tweeter voice coil heating as an amplifier that clipped intermittently. 2dB is a barely audible SPL increase. Not that anyone wants to listen to intermittent amplifier clipping ... but intermittent clipping is often overlooked or blamed on bad recordings or harsh speakers ... until a tweeter dies -- then audiophiles and salesmen gather around the dead tweeter and declare without a doubt that the amplifier did not have enough power ... and a new more expensive and more powerful amplifier is the only answer to prevent tweeter damage. This is an urban myth ,,, but audio salesmen love it !