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Since bishop may be wrong-colored or bad, doesn't that make knight stronger piece overall?

nope. Eventually board will open - ususally - and bishop will be stronger in most endgames. In particular in endgames that have pawns on both flanks.

Fischer said a knight is worth 3 pawns and a bishop 3.25 pawns. Kasparov later concurred.
Indeed there are sometimes good and bad pieces. No big deal.
Knights can also be bad pieces, e.g. dominated, and/or lame (stuck on sides of board).

But having said that, depends on rating, lower rated players find knights tricky and typically don't use the bishops correctly by blocking them in or missing long range captures. A key issue for newer players are ranged pieces are harder to use when as you tend to be short-sighted on the board. So poorly used bishops are worse than poorly used knights since knights can accidentally land a fork easier than a bishop. This is from my own experience over the year or so as I got back into chess.
If the bishop is bad, it doesn't necessarily mean that the knight is better. It may be stuck on the side of the board:)
depends on the situation really, but knights tend to be better in fast-paced games because their moves are harder to calculate
It's usually a good idea to post knights on opposite color of the opponent's single bishop, other things being equal. As result of doing this, the bishop can't dislodge the knight from the secured outpost.

Kasparov said that he agreed with Fischer but that he personally prefered the value 3.15 instead of 3.25.

The knight is said to increase in value when short on time. Bullet and blitz without increment. Harder to predict in the time scramble. The bishop is more foreseeable, limited to one-color at all times. It should not surprise me that a knight can increase by about a pawn in base value at bullet/blitz time scrambles against single bishop. Not always but more often that not.
www.chessgames.com/perl/chessgame?gid=1044855

Bishops can shine in the endgame even if they are on a bad color if there are pawns on both sides of the board. Their strength in the endgame is generally why they are considered better; the better and better you get at chess the more important the endgame becomes.
This argument that a knight is better overall because sometimes bishops are bad is like saying shotguns are better than sniper rifles because if you have a home intruder the shotgun is more reliable than the sniper rifle... Give me a sniper rifle and you a shotgun I'm going to pick you off from way far away before you get any place close I don't care how good your shotgun is indoors. it's easier to have a good bishop than it is to have a good knight. Fianchetto that bishop in just two moves and it's on a long diagonal probably going to be at least a decent bishop for a long time attacking all those squares. Knights don't naturally have outposts like a bishop can be fianchetto. Knights are close range pieces too and wind up more easily exposed since they have to be out there on the battlefield when a bishop can be a sniper from afar menacingly.

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