In fairness, Mount Pinatubo is far more dangerous than Etna. Pinatubo's last eruption was, together with Mt. St Helen's 1980 euruption, the largest volcanic eruptions in the XX's century.
Etna on the other yhand, is a very tame volcano. A huge, beautiful, very frequently active (it had 4 eruptions just this year and has been active pretty much every year for a long time now), but very tame volcano that in general only poses a high threat to tourists that are either
too dumb or reckless, or people with
very bad luck (as Etna commonly produces "random" explosions in lots of different locations, especially during winter when lava come in contact with ice water).
Etna's "explosive" potential is very low (unlike it's fellow "countryman" Mount Vesuvius whose explosive potential is extremely high). The greatest danger Etna poses to sorrounding citites is actually the danger of a future colossal landslide, like the one that created the huge Valle Del Bove when the entire east flank collapsed. And while Etna commonly spews lava from it's many vents, it's usualy in low quantity and it's very thick lava that very rarely reaches far down the mountains huge slopes.
That being said, I recommend a visit to anyone who has even a slightest interest in volcanoes. There is forms of transportation all the way to the summit area, by road, then by cable car, then by special trucks. Only the red zone, the last 400 meters from the top around the summit craters is off-limits without authorized guides (and even then only when it's deemed "safe"). But it's one of the easiests ways to feel like you're on the surface of another planet.