[bojan]

Yes they are...

But again, it is about power density at the retina - how much power (in joules per second or W) is falling on the unit area (mm2) , and if this value is high, power can not be dissipated fast enough (factors here are thermal conductivity of the retina tissue, blood flow and so on) and the temperature in that spot goes up (until a thermal balance is achieved again).

In case of point-like source (star), all incoming light (power received by eye through the telescope) is focussed into one spot (or very small area.. better the optical system, smaller the focal point) so the power density could be very high and this could result in high temperatures (on that small area).

Sun and Moon are extended light sources, their images on the retina are relatively large and the power density (W/mm2) or illumination is much lower, so the thermal power is spread over larger area and is less dangerous (in Moon's case only of course), especially if higher magnifications are used.

All this is of course idealised case - my (rough) calculation is based on solar constant and assumption that all power is received and converted into heat, and I assumed the spectral density of eta when it blows up will be similar to Sun's light - which it won't, of course - I think the spectral peak will be in UV, so the thermal effect will be smaller (because of Earth's atmosphere).
Also, if any kind of filter is used at the telescope end, the effect will be diminished further .