Anyone else remember the constant talk about "10000 children" in Israeli jails "without charge"?

In the beginning I remember seeing a lot of "buT iSraEl HAs 4000 cHiLdRen CAptiVe wiThouT tRIaL!". Later it turned to 10000. Now all of a sudden, it turns out Israel only has about 6500 Palestinians all together; a lot of whom are convicted of violent crime/homicide/attempted murder etc. and a measly 170 of which (or 200, depending on the source) are minors (most of which 16+)...

Turns out, no, Israel does not imprison random children for "just being Palestinian". That was all propaganda... How the hell did they think they could get away with this ridiculous claim (and the ridiculous amount of 4000 (or 10000))??