Because Al Jazeera is a project of the Al Thani royal family whose chief aim is to exacerbate the external conflict to maintain Qatar's internal political stability.
But the specific information in the article could still be true.
So could an infinite variety of motivated claims, but without a second source for it, I'd remain skeptical.
Yes, you always need more sources, that's why I don't dismiss it as propaganda. It would not be the first time that a news org lies, and it would not be the first time that the IDF lies.
> you always need more sources, that's why I don't dismiss it as propagand
What?? I will dismiss it as propaganda until I see it corroborated by a more neutral third party.